"The Solenhofen slate of Bavaria, " writes Professor H. G. Seeley in his recent little volume, ' 'The Story of the Earth In Past Ages. " "inakes known nnmeróns insects and other furms of terrestrial lifeof this period, includingthe oldest known bird. A bird is known by its feathers, though there is no reason why the coveriug to the skin should not be as variable in this group of animáis as amoug reptiles or marnaaals. It is, therefore, reniarkable that the oldest known bird, the archseopteryx, has feathers as well developed as in the existing representativos of the olass and similarly arranged. The animal is an elegant, slender bird, which is chiefly reniarkable for showing teeth in the jaws A bont 12, short and conical, occur on each side of the upper jaw. The bird was larger than the robin in its body and had a tail of -which there was a bony core some six inches in length. The wings were quite as well developed as the legs, and there are some evidences that the former could be applied to the ground, as are the fore legs of quadrupeds, although the feathers show the wings to have been constructed on the same plan as the birds of today. The Solenhofen stone, in which so many of the remains of fishes, reptiles and insects are found, is the same as that used f or lithographic purposes, being of exceeding close texture and of remárkable smoothness when prepared for its work. "