Its eight hundred parts of copper, twenty-five is recent. The inundations by which the lower country is frequently submerged come from the Poyang Lake, concerning which very little is actually known, either as regards its floods or its rain-falls. It is known only that there is evidence of a great thinning out of forests on the mountains of Southern Kiangsi, although it has not been carried to the extent that Che-kiang has experienced, where arboriculture is system-ric acid, are not attacked by organic acids, atically pursued to meet demands for tim- and are only slightly attacked by inorganic ber. In the hills near the coast, which are acids. stripped annually of grass, ferns, and bushes for fuel, the process of the gradual denudation of the hills is distinctly observable. The soil is never carpeted by leaves; no humus forms; rain, instead of slowly percolating as through a sponge, rushes in water-courses as from the roof of a house into gutters, speedily filling them, and carrying with it soil, which tends to increase the evil. In this way the lakes are destined to become desiccated much sooner than they oth erwise would be. It is because of the occasional sudden rush of waters that freshets are always attributed to the spouting of chias-subterranean monsters. Several of those are reported as being concerned in the late floods. While there is conclusive evidence that there has been in recent times a great destruction of forests, it is not clear that floods have proportionately increased in number or rapidity; it is, however, what might be expected, and it is what is affirmed by natives when accosted on the subject. Deforestization has had one favorable effect in the south of China, in reducing the ravages of jungle malaria, which recedes with the advance of agriculture. New Serviceable Metallic Alloys.-Three new metallic alloys have been recently introduced, which seem fitted to serve as substitutes for bronze, imitation gold, and imitation silver. Delta, a bronze made by Mr. Alexander Dick, of London, is a compound of iron, zinc, and copper, the proportions of the ingredients being varied according to the color it is sought to obtain, and has the advantages of extraordinary tenacity and flexibility. It can be beaten, and forged, and drawn when cold, takes a perfect polish, and, exposed to the air, is less liable to tarnish than brass. Aphthite is a "gold," which does not change, and is composed of NOTES. MR. F. H. KING, State Geologist, estimates the bird population of Wisconsin at sixty-six per square mile, or 3,565,000 for the State. Each bird is assumed to eat fifty insects a day, or 6,000 for the summer. Hence all the birds will consume 21,384,000,000 insects a year. "Add to this amount the work which these birds do in their Southern homes, and we have a low estimate of the influence they exert over insect life." AN improvement on the Bunsen cell, by acidulated water a solution of about fifteen M. Azapis, consists in substituting for the per cent of cyanide of potassium, caustic potash, common salt, or sal-ammoniac. The intensity in the new form is as great as in Bunsen's, and the advantages are, greater constancy, less waste of zinc, and very little smell; further, the zinc does not need amalgamating. H. T. CRESSON has obtained, from Aztec clay flageolets, the fourth, seventh, and octave tones of the diatonic scale, and the additional sounds or semitones which constitute the chromatic scale. These notes are produced by means of the four finger-holes and by stopping or half stopping the bell of in different keys, and, if the Aztecs knew the instrument. The flageolets are pitched the full capacity of their instruments, their music must have far surpassed that of other uncivilized peoples. PROFESSOR ARCHIBALD GEIKIE remarks, concerning the future history of the Grand Cañon of the Colorado, that it has still about of its channel before its slope will become a thousand feet to remove from the bottom so slight that its erosive power will nearly cease, and that it is conceivable that, should no geological revolution occur in the region, the cañon may still be deepened to that amount. There are indications, however, that a limit may be set to the possible depth of the chasm. As in the " creep " of a coalmine, the bottom of the cañon, relieved from the weight of the overlying column of rock, may be forced upward by the pressure of the walls on either side. In that case, the channel might rise as fast as the river cut it down, so long as nothing occurred at the surface materially to diminish the height of the walls. SHAD, which were first introduced there seven years ago, are now to be found all along the coast of California, and are rapidly making their way northward. The "run" in the Columbia River this year was described as wonderful, and the fish were a drug in the market. In California they have not yet come into popular use, owing partly to the fact that the closed season established by law is just when they are in the rivers. The order of their running in that State is different from that in the Atlantic States. They appear in San Francisco Bay in October, and leave it in May; while for other parts of the coast their run begins later as the latitude increases. THE Convocation of the University of Oxford has voted £10,000 for building a laboratory, working-rooms, and lecture-room for the Waynflete Professor of Physiology, Dr. Burdon-Sanderson. The grant was opposed by some of the members of the board, on the ground of their objections to vivisection, but was carried by a majority of three in a house of one hundred and ninety-three members. A CURIOUS application is made of liquid carbonic acid at Krupp's foundry, in Essen, Prussia. The cannon made there are bound with rings, which are put on in nearly the same manner as the tires are put on wagonwheels; that is, they are heated very hot, and driven on over the cold cannon, so that when they cool they hold it very tight. Sometimes it is desirable to get the rings off. This is done by freezing the cannon by means of the evaporation of liquid carbonic acid, when they contract and leave the rings loose. The French journal, "La Production," calls the operation "a formidably neat one, and of really Herculean elegance." DR. CHAILLÉ, of New Orleans, has made a study of the influence of the inundations to which Louisiana is subject upon health. He finds that they do not cause inevitably or generally any notable increase of malaria or of other disease, and that they certainly do not usually either cause or promote epidemics. Their direct influence is, therefore, not usually to be dreaded. They may, however, in certain soils and conditions be charged with after-influences of a deleterious character, as when the soil is loaded with malaria, or deposits of filth have accumulated upon it. Such soils and deposits, festering in the sun after the floods have retired, may develop very serious evils. M. PERRIER describes an Asteria (Caulaster pedunculatus) that was dredged up in the Travailleur expedition, which appears to furnish a link between the ancient crinoids and the modern star-fishes. It is a star-fish, having on its back a peduncle quite similar to that of the crinoids, which is surrounded by a system of plates resembling those that composed the "calyx" of those animals. The peduncle probably served as a support for the young star-fish while it was temporarily fixed, and was probably destined to disappear by the progress of development; but this view needs to be confirmed by further examination. M. MARCHAND, having repeated with water some of the experiments which Professor Tyndall has performed on the air, declares that there is no really clear water in existence. Filling a bottle with the liquid, he covered it with black paper, and pierced in the paper two holes at opposite points. Looking through the holes at the light, the dust-particles floating in the water were made plainly visible. They were transparent, only two millimetres in diameter, and elastic enough to pass through the closest filters. MR. JOSEPH WILLCOX remarked at a recent meeting of the Academy of Sciences of Philadelphia on the scarcity of springs and running streams in Canada. Where streams exist, they are almost exclusively the outlets of lakes. He ascribes the feature to the fact that the ancient glaciers swept away a large proportion of the soil of the country, leaving the underlying rocks usually near the surface, and in many cases visible above the ground. Thus the material is deficient which, in countries where springs and streams abound, soaks up the rain and meltnial flow of water. ing snow, and afterward gives out a peren "LA NATURE" records the death, at Catania, Sicily, in the thirty-third year of his age, of M. Tedeschi di Ercole, an investigator of earthquakes and volcanic and other physical phenomena, and a frequent contributor to it on subjects relating to them. MR. 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