That the machine so built might traverse the water as well as air.

* * * * *

THE LONGHAIRED POINTER MYLORD.

Pointers are trained to search for game, and to indicate that they have found the same by standing motionless in front of it, and, when it has been shot, to carry the game to the huntsman.  Several kinds of pointers are known, such as smooth, longhaired, and bushyhaired pointers.  The smoothhaired pointers are better for hunting on high land, whereas the longhaired or bushyhaired dogs are better for low, marshy countries, crossed by numerous streams, etc.  Mylord, the dog represented in the annexed cut taken from the Illustrirte Zeitung, is an excellent specimen of the longhaired pointer, and is owned by Mr. G. Borcher, of Braunschweig, Germany.

[Illustration:  THE LONGHAIRED POINTER, “MYLORD.”]

The longhaired pointer is generally above the medium size, powerful, somewhat longer than the normal dog, the body is narrower and not quite as round as that of the smoothhaired dog, and the muscles of the shoulders and hind legs are not as well developed and not as prominent.  The head and neck are erect, the head being specially long, and the tail is almost horizontal to the middle, and then curves upward slightly.  The long hair hangs in wavy lines on both sides of his body.  The expression of his face is intelligent, bright, and good-natured, and his step is light and almost noiseless.

The pointer is specially valuable, as it can be employed for many different purposes; he is an excellent dog for the woods, for the woodsman and hunter who uses only one dog for different kinds of game.  The intelligence of the German pointer is very great, but he does not develop as rapidly as the English dog, which has been raised for generations for one purpose only.  The German pointer hunts very slowly, but surely.  It is not difficult to train this dog, but he cannot be trained until he has reached a certain age.

* * * * *

LUNAR HEAT.

By Professor C.A.  YOUNG.

One of the most interesting inquiries relating to the moon is that which deals with the heat she sends us, and the probable temperature of her surface.  The problem seems to have been first attacked by Tschirnhausen and La Hire, about 1700; and they both found, that even when the moon’s rays were concentrated by the most powerful burning-lenses and mirrors they could obtain, its heat was too small to produce the slightest perceptible effect on the most delicate thermometers then known.  For more than a hundred years, this was all that could be made out, though the experiment was often repeated.

It was not until 1831 that Melloni, with his newly-invented “thermopile,” [1] succeeded in making the lunar heat sensible; and in 1835, taking his apparatus to the top of Vesuvius, he obtained not only perceptible, but measurable, results, getting a deviation of four or five divisions of his galvanometer.