File:The passenger pigeon in Pennsylvania, its remarkable history, habits and extinction, with interesting side lights on the folk and forest lore of the Alleghenian region of the old Keystone state (1919) (14784470382).jpg

Identifier: passengerpigeoni00fren (find matches)
Title: The passenger pigeon in Pennsylvania, its remarkable history, habits and extinction, with interesting side lights on the folk and forest lore of the Alleghenian region of the old Keystone state
Year: 1919 (1910s)
Authors: French, John C., 1858-
Subjects: Pigeons
Publisher: Altoona, Pa., Altoona tribune company
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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rmth, as the parent pigeons sit alternatelyupon the nest. When the Ggg is first produce:\ the future squabis indicated by a little germ-spot, barely the size of asingle oat-grain with hull and shuck removed; withoutpower of breathing atmospheric air and receiving nour-ishment into its mouth, until the incubating period haselapsed. To watch the development in the Ggg is aninteresting experiment and full of suggestive instruc-tion. The structure is so balanced, that to view tfielittle germ-spot it is only necessary to lay the egg onits side and remove a portion of the shell, when thegerm will be seen lying immediately under the aper-.ture. In whatever way the egg may he turiied, thegerm-spot presents itself at the highest point, providedthe egg be laid on its side, and that the living prin-ciple has not been extinguished. As growth proceeds,mxanipulation becomes easier, but it is best to immersethe egg in water, before removing the shell, and tokeep it submerged chtring the examination.
Text Appearing After Image:
JOHN H. CHATHAM 76 THE PASSENGER PIGEON IN PENNSYLVANIA seen on each side of the thread, the commencement ofthe vertebrae. The parts seem to be a crystallizationfrom^ the substances of the egg. By the end of thefirst day the germ curves, looking like a tiny maggotas it lies on the edge of the yolk. The little heart isperceptible, the second day; the arteries and veins sup-pHed with blood, are perceived the third day. So thevarious organs appear, one after another, as the bodyis built up; the feathers being the last, on the twelfthday, and the squab pierces the air-sack, with its beak,at the blunter end of the tgg; and hammers on theshell with its horn-tipped beak. The young bird has been nourished by the yolk,which is connected with its abdomen, and which isseparated soon after the shell is broken, enabling thesquab to respire freely. The shell is pecked in a cir-cle, cutting for itself a trap-door, which often remainssuspended by a hinge of uncut lining membrane,through which the squ

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