According to the connections of the aerial and the complete set it will be noted that, when sending out the electrical waves, the alternating currents will radiate in every direction and will travel in proportion to the strength and capability of the set in regard to transmission. The system, if adopted by air-men, will give better results high in the air where there is little of atmospheric disturbance and therefore greater and better results can be accomplished. The distance in the air will be three to four times as great with the same set than if used on land.

THE LEAF OF THE SUNDEW.

Here is an interesting example of a device used by a plant to catch its insect food. There is a little sweetness in the center of the leaf and when a fly alights it is caught by the quick turning in of the tentacles. These hold the fly in position until it is digested, that is until actually eaten by the plant.

the aid of the rubber tires, which prevent the escape of the high tension oscillating currents through the frame and wheels, thereby insuring a perfect ground insulation, the experimenters

were enabled to communicate for the distance of about 31⁄2 miles without a

ground connection. The experiment took place along the banks of the Charles River with Jonescick Brothers at the foot of the Cambridge Bridge and Mr. I. Wolff at the foot of the North Harvard Street Bridge.

TEETH, RESPECTIVELY. OF WALRUS, SAWFISH, SWORD

FISH, SPERM WHALE AND ALLIGATOR.

TRACTION THRESHING MACHINES OF A NEW SORT. There is a man in Skowhegan, Maine, who has invented a traction threshing machine. The power is a gasoline engine and it is moved about by its own power with the separator which is built on a jigger of the four-wheeled delivery cart style. In moving the threshing machine from place to place it travels at the rate of about four miles per hour. It threshes grain faster than it can possibly be threshed with the old fashioned threshing-machine with horses.

For instance, the two outside ones are the tusks of a walrus. They are the upper incisor teeth of the beast, and are not intended for chewing, but for defense.

All through creation is found the most astonishing adaptation of teeth to necessity. Thus the mighty ivory lance of the narwhal, ten or twelve feet long and strong and sharp enough to be driven through the side of a ship, is simply the left upper incisor of the creature. Once in a while, by a freak, both upper incisors will be developed in the narwhal, so that it is equipped with two spears instead of one. The female has no lance.

Likewise, the tremendous ivory spear of the swordfish is merely a gigantic tooth developed for fighting purposes.

NEW REVOLVING CYLINDER MOTOR FOR AEROPLANES

SINCE most of the laurels won by

heavier than air flyers have gone to motors of the revolving cylinder type, a new motor, by the world's first builders of that type, an American concern, is of especial interest. The first successful motor of this type was constructed in 1898.

The most interesting improvement found on this motor and perhaps the most important advance made in the construction of aviation motors since the intro

MINIATURE WOODEN MODEL OF THE U. S. POSTOFFICE DEPARTMENT BUILDING, WASHINGTON,

the elimination of the carburetor and employment of injection with a means for absolutely regulating the amount of gasoline injected into each cylinder, and insuring that all cylinders will receive exactly the same mixture. This also makes it possible to do away with the inlet valve, and employ one valve for both inlet and exhaust, as only air is

A BIRD'S CEMETERY IN GERMANY. This is at the health resort at Beelitze. It is looked It often hap after by the patients at the Sanitarium. pens that the singing birds of all kinds which fly about the Sanitarium strike against the glass windows with such force that they fall to the ground killed by the impact. The patients bury these birds in a place set apart for the purpose. Every bird has its own grave adorned with some crosses and monu

drawn in by the suction stroke of the piston, while the gasoline is sprayed within the cylinder where it is mixed with the charge of air before compression. Having but one valve in the head of the cylinder, it can be made amply large to insure a

full charge and a free exhaust.

In order to relieve the cam controlling the action of all five valves from the heavy load of opening a large valve against the high pressure at the time. exhaust takes place, the cylinders are provided with auxiliary exhaust ports, which are uncovered by the piston on its downward stroke. No check valves are required over these auxiliary ports, as on the suction stroke, pure air and not a mixture of gas is drawn in, so what air

gree to the true centipedes.

Secondly, they are not only harmless, but very beneficial, inasmuch as they eat cockroaches, bedbugs, and other noxious insects. They are extremely fragile, so that hardly more than a touch will break them to

pieces. If cornered, they are capable of inflicting poisonous bites, but this is a thing that almost never happens.

There is an old wives' notion to the effect that these queer bugs get into people's ears and make trouble. It has just about as much basis in fact as the idea that bats are liable to become entangled in women's hair.

MAIL

MYRIAPOD THE HOUSEWIFE'S FRIEND

THE average housewife has a particular horror of "centipedes," as she calls the many-legged insects which now and then make their appearance in odd corners of her ménage. They certainly do have a weird and unpleasant appear

ance.

In some respects, however, she is mistaken about them. To begin with, they are not centipedes at all, properly speaking. Entomologists call them "myriapods," and they are not even related in the slightest de

THIS photograph shows a very useful and simple device and a great convenience to the rural mail carrier. The idea was taken from a dining room "dumb waiter" by the handy man, who utilized the stump of a tree and a wagon wheel. The top of the stump was cut away leaving only a small "spire" to project up through the hub of the wheel and forming a pivot for the same. boxes were mounted on the wheel by fastening them to the felloe and spokes. The contrivance revolves, so that the carrier never needs to leave his wagon making but one stop to serve 14 patrons. The photograph was made in New Market, Clark county, Indiana, a small village where a post office had

Mail

been aban

doned when

rural service began. Oscar Harmon, of Marysville, Ind., is the mail clerk "on the job."