The same distinction appertains to the twenty or thirty varieties of canary, which are in an adjoining case, and which are the descendants of some ancestors whose little wings were not bright yellow at all, but a dull brownish green. The domestic fowl in the same case are intended to exhibit similar artificial peculiarities, though it should be noted that the nine-feet-long tails of the Japanese bantam are not so much the result of breeding as of eccentric cultivation, for the unfortunate bird's feathers are carefully trained in this way throughout the whole of an uncomfortable life. But the lesson in evolution which these cases seek to convey is to be carried out on a much larger scale. At the further end of the Central Hall are to be ranged a number of specimens of dogs, cows, goats, horses, cats, every species, in fact, of which mankind has produced definite breeds. Even fish, bees, silk-moths, and the greatly modified native oyster will find representation here. The nucleus of the dog collection has already been formed, and includes a mastiff of the old English breed, heads of the Irish wolf hound, Danish and French mastiffs, Russian and Mexican lap dogs, remarkable for their smallness, and Fullerton, the famous coursing greyhound. Numerous skulls, and several mummied dogs, given by Professor Flinders Petrie, will add to the interest of this collection. The authorities hope that persons who lose pure-bred or prize animals by death will present their bodies to the museum in order that they may be added to this extremely interesting display. THE CECROPIA MOTH. REST H. METCALF. The cecropia, a lepidopterous insect of the family _Bombycidiæ_, is the largest and most beautiful of our American moths. It is quite generally distributed throughout the United States. The large wings, measuring from five to six inches, are covered with dusky brown scales, the borders richly variegated and beautifully marked, the anterior ones having near the tops a dark spot resembling an eye, and both pairs of wings having kidney-shaped red spots. The caterpillar or larva is nearly as beautiful in color as the perfect moth, being about three inches long, of a light green color with coral red, yellow and blue warts with short black bristles near its head. It feeds on the leaves of nearly every species of forest fruit and shade trees, till late in August or September; then it descends from the trees to seek some shrub upon which to fasten its winter home. Occasionally they will be satisfied with a location in a tree-top, but not often. This home building is exceedingly interesting, and although you can watch them only for a few hours you still linger near and imagine what you cannot see.