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moderate muscular work, a mother, a boy of twelve and one of six and a girl of ten. The diet covers the six requirements usually considered and therefore all the other essentials.

The values for vitamines could not be included because the quantitative aspects of this problem have not yet been fully worked out for man. The need for the water soluble vitamines will be covered by an adequate diet of this character and the need for the fatsoluble vitamines is safeguarded by the milk.

It is easy to pick out from this table the food groups which furnish each of the food needs for the least money. In the lists below the cheapest foods are at the top in each list, the next cheapest second, etc. Calories Protein Calcium Phosphorus Iron sugar grains cheese

cheese vegetables grains nuts

milk grains grains fat cheese vegetables milk meat meats

fruit In the accompanying charts compare the height of each of the columns that stand for food values with the height of the cost column. Then it will be plain whether or not those foods furnish that food value cheaply. For instance, look at the chart for grain products: a glance will show that in these foods we buy protein, calories, phosphorus and iron cheaply but that grains are expensive sources of calcium. Compare the chart for milk with this: the values are reversed, as milk is a very cheap food for calcium but rather expensive for calories and protein and too expensive to be considered as source of iron. Now look at the chart for vegetables : vegetables more or less reënforce the food values of milk. Indeed, in the Orient they are used in place of milk, which is scarce. Milk, grains, and les supplement each other and make a satisfactory foundation diet which can be filled out by other foods.


Per cent of total food values

obtained from grain products Grains are almost the cheapest source of energy among the various foods and as the need for cheapening the diet increases, greater reliance must be placed upon them for supplying the foundation of our nourishment. As the chart shows, however, grain products are conspicuously lacking in calcium. They are also

rule deficient in vitamines so that grain products should be used with foods high in calcium and vitamines such as milk and vegetables. These three, supplying in the largest quantities all the main elements of a complete diet, when taken together form an excellent foundation which can be supplemented by the other foods


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Wilson's petrels (Oceanites oceanicus oceanicus), or "Mother Carey's chickens, are familiar to all ocean travelers and to all dwellers along the
Atlantic seacoast. These scavengers of the Atlantic follow in the wake of ships for days at a time, their black and white forms blending with the
rolling shadows of the waves or standing out in sharp silhouette against a glassy sea. The petrels are known especially for their habit of walking (or
more properly, skipping) upon the surface of the water as they feed on floating morsels, and accordingly it is said they derive their name from St.
Peter, the apostle, who walked upon the waves. Moving pictures show that the birds do not advance step by step, but by a kind of two-footed hop.
Mr. Robert Cushman Murphy, curator of the department of natural history in the Brooklyn Museum, has demonstrated, through observations made
during a long sea voyage and by examination of many specimens, that the petrels of the South Atlantic and those of the North Atlantic are one and the
same species, which breeds in remote parts of the Southern Hemisphere and migrates to the Northern Hemisphere during the Antarctic winter (our
summer). Mr. Murphy also observed on this voyage that the petrels can dive most.skillfully to a depth several times their length

Scientific Zoological Publications of the

American Museum for 1918

Summary of work on invertebrates, fishes, amphibians, and birds *


Editor of the Bulletin of the American Museum


OR the most part, papers in the Bul. call of some one actively engaged with the

letin and Memoirs of this Museum are species in question. This was what happened

technical in both language and sub- with the leaf-hoppers. Mr. Olsen is an amaject matter. Like other papers of the same teur entomologist who is an authority on character they are stones which have been these creatures, restricting his studies almost carved for the great Science building and entirely to this one family. This paper is, some of them, when viewed separately, may furthermore, an illustration of the mutually be of no more interest to the unprofessional helpful coöperation which exists between the man than an isolated building stone would American Museum and students and scholars be to one who was not an architect. The fol- outside of its scientific staff; the Museum lowing brief notes indicate the general set- stores up more material than its staff is able ing of these technical publications and point to study, but this material is eventually out interesting features of individual papers. used by outside scientists and returned to

the Museum properly classified and duly reResearches on Invertebrates

ported upon.

It is of interest to note that One of the Bulletin articles 1 describes the seven of the nine entomological publications anatomy of a leech which lives on the skin during 1918 were the result of such coöperaof the under side of the flippers of the Flo- tion. ridian green turtle, Chelonia mydas. Eight The department of invertebrate zoology of the Bulletin articles and one Memoir deal has for some time been planning its field with insects, highly specialized—both in work so as to get material for a study of structure and habits-members of the same geographic distribution, with special refergrand division of the animal kingdom, the ence to the problems of isolation and of Invertebrata, to which leeches belong.

faunal movements between North and South Mr. Olsen 2 reported on the leaf-hoppers America. As a part of this work the which had been obtained from time to time Floridian insects have been carefully studied. by various expeditions and preserved for The fifth of a series of reports on this study. There are so many thousands of spe. part of the work, is by Messrs. Leng and cies of insects that no one man can be an Mutchler 3 on the water beetles of Florida. authority on all of them; and this Museum It lists all the known species and gives dishas definitely connected with its scientific tributional and biological notes, together staff specialists in only three orders.

with keys for the identification of certain result, the material obtained by expeditions species. cannot be even largely worked up shortly Mr. Wm. Beutenmüller, when connected after an expedition returns, but the groups with the American Museum, did much work not immeiliately provided for must await the toward the preparation of a monograph on

moths of the genus Catocala, the moths 1 MacCallum, W. G., and MacCallum, G. A. 1918. On the Anatomy of Ozobranchus branchi

whose front (upper) wings are usually colatus (Menzie). Bull. A mor. Jus. Vat. Hist., ored and marked like bark but whose hind XXXVIII, Art. 12, pp. 395-408, Pls. XXXIII to XXXVIII.

wings, covered when at rest, are often banded 2 Chris

E. Olsen. 1918. North American Cicadellidæ in the Collection of the American 3 Leng, Chas. W., and Mutchler, Andrew J. Museum of Natural History, Subfamily Cicadel- 1918. Insects of Florida, V. The Water Beetles. linæ. Bull. Amer. Mus. Vat. Hist., XXXVIII, Bull. Amer. Jus. Vat. Il ist., XXXVIII, Art. 3, Art. pp. 1-6.

Pp. 73-116. * Summary of work on mammals, recent and fossil, will be published in a later number of NATURAL HISTORY

As a

their types in private collections which are difficult of access and subject to all the dangers of storage in a private house and of possible lack of care when the owner's interest lags or he dies. The American Museum offers exceptional advantages as a repository of type material, being in a city which is a center of travel, and having not only fireproof cases in a fireproof building but also a system for the special care of types as distinguished from ordinary speci


with bright colors. After the severance of his connection here, the manuscript and drawings were sent for editing to Dr. Wm. Barnes, a physician who owns the largest private collection of moths and butterflies in America and who employs several assistants to work on it. A Bulletin articlel and a superbly illustrated Memoir2 are the result of this coöperation. The Bulletin article contains notes on the life histories of twentyeight species, the outcome of extensive breeding experiments carried on by Dr. Barnes and his assistant, Dr. J. McDunnough, during several seasons. For the most part the experiments deal with species of which the early stages were either partly or totally unknown. The "text" of the Memoir consists essentially of the extensive captions of the twenty-two plates, giving notes on synonymy, distribution, etc. The plates are the work of Mrs. Wm. Beutenmüller, together with several by Mr. S. Fred Prince. Seventeen of the plates are in color, showing a large number of larvæ and the adults of most of the American species wonderfully reproduced by the Heliotype Company.

Dr. E. P. Felt, New York State Entomologist and an authority on the small midges, many of which cause galls on plants, examined and reporteil upon 3 the type material in the American Museum belonging to the family Itonididæ (formerly known as Cecidomyidae). When an author describes a species that he believes has not been described before, the material which he has before him at the time and from which he writes his description is known as "type" material, and the author usually designates (he always should do so) a single specimen as "the type.” Subsequent students refer to these types when revising the classification of a group. In this way Dr. Felt made some important changes in the nomenclature of the gall midges and drew up more complete technical descriptions than did the original author. Unfortunately, many authors keep

The red-eyed fruit fly (Drosophila melanogaster, formerly known as D. ampelophila) has been much used for a study of the laws of inheritance. Dr. A. H. Sturtevant, who has been very active in such work, is also a good student of classification and has written a paper 4 which furnishes keys for the identification of the relatives of this interesting creature as well as notes on their biology and distribution.

White ants, which are really not ants but are more nearly related to dragon flies, have most interesting habits. The paper 5 by Mr. Nathan Banks does not deal with these habits but will help students of termite habits to identify the species with which they are working. Several new species from the American tropies are described. The same remarks apply to Prof. T. D. A. Cockerell's paper on

some bees from British Guiana.

Dr. J. Bequaert has published: a very full account of the Vespidæ (social wasps and their relatives of the Belgian Congo. It is based on the collection brought back by Messrs. Lang and Chapin. Keys to and complete descriptions of the species are given, together with copious notes on habits, distribution, etc. The author says of Symagris : "No other genus of solitary wasps offers such an amount of interesting ethological problems. Some of the species are still true to the

1 Barnes, Wm., and McDunnough, J. 1918. Life Histories of North American Species of the Genus Catocala. Bull. Amer. Mus. Nat. Hist., XXXVIII, Art. 5, pp. 147–77.

? Barnes, W'm., and McDunnough, J. 1918. Illustrations of the North American Species of the Genus Catocala by W'm. Beutenmüller, with Addi. tional Plates and Text. Mem. Amer. Mus. Nat. Hist., III, N. S., Part 1, pp. 3-47, Pls. I-XXII.

3 Felt, E. P. 1918. Notes and Descriptions of Itonididæ in the Collection the American Mu seum of Natural History. Bull. Amer. Mus. Nat. Hist., XXXVIII, Art. 6, pp. 179–82.

* Sturtevant, A. H. 1918. A Synopsis of the Nearctic Species of the Genus Drosophila (sensu lato). Bull. A mer. Mus. Nat. Hist., XXXVIII, Art. 14, pp. 441-46.

5 Banks, Nathan. 1918. The Termites of Panama and British Guiana. Bull. Amer. Mus. Nat. Hist., XXXVIII, Art. 17, pp. 659–67, PI. LI.

© Cockerell, T. D. A. 1918. Bees from British Guiana. Bull. Amer. Mus. Nat. I ist., XXXVIII, Art. 20, pp. 685-90.

. Bequaert, J. 1918. A Revision of the Vespidæ of the Belgian Congo Based on the Collection of the American Museum Congo Expedition, with a L of Ethiopian Diplopterous Wasps. Bull. Amer. Mus. Nat. Hist., XXXIX, Art. 1, pp. 1-384, Pls. I-VI and 267 text figures.


From Bequaert's Revision of the

Vespide of the Belgian Congo AN AFRICAN WASP COLONY Wasps are conveniently distinguished as social or solitary in accordance with the methods they employ in building their nests. The social wasps live in community nests, most commonly made out of a sort of paper which they manufacture by chewing wood; the solitary wasps construct individual mud houses. Members of the American Museum Congo Expedition frequently found on the under side of thatched roofs (a portion shown in the photograph) hundreds of wasp nests (Synagris cornuta) constructed from kaolin-a kind of clay used by the natives in whitewashing the walls of their huts. The wasps had sucked moisture from the brook near by and mixed it with the clay which they had then rolled with the front legs and kneaded with the mandibles into the required shape of the nest. This consists of cells each containing a larva and provided with a bent-necked entrance. Each female builds her own nest and feeds one larva at a time from day to day with ground-up caterpillars until it is fully grown; after which the neck of the cell is broken off and sealed for the period of metamorphosis to the fully developed wasp. Two or even three of the necked entrances, however, can sometimes be seen on the same mud lump (not to be confused with the many small holes made by the full-grown wasps in breaking out); each of these necked entrances is attended by one female wasp. In the habit of nesting in dense colonies and of nursing its larvæ from day to day, the horned synagris forms a sort of connecting link between the solitary and the social wasps

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