Development of the Digestive Canal of the American Alligator

This is a fiction book. In a previous paper the writer described the general features in the development of the American Alligator; and in other papers special features were taken up in more detail. In the present paper the development of the enter on is described in detail, but the derivatives of the digestive tract (liver, pancreas, lungs, etc. ) are mentioned only incidentally; the development of these latter structures may be described in a later paper. No detailed description of the histological changes taking place during development has been attempted, though a brief description of the histology is given for each stage discussed. The material upon which this work was done is the same as that used for the preceding researches. It was collected by the author in central Florida and southern Georgia by means of a grant from the Smithsonian Institution, for which assistance acknowledgment is herewith gratefully made. Various methods of fixation were employed in preserving the material. In practically all cases the embryos were stained in toto with Borax Carmine and on the slide with Lyon's Blue. Transverse, sagittal, and horizontal sections were cut, their thickness varying from five to thirty microns, depending upon the size of the embryos.