Edinburgh journal of natural history Edinburgh journal of natural history and of the physical sciences . edinburghjournal01macg Year: 1835 AND OF THE PHYSICAL SCIENCES. 14; DIGESTIVE ORGANS OF BIRDS. NO. II. Is the Number for May 1837, p. 94. was presented an outline of the digestive or- gans of the Red Grouse, Tetruo Scotictis, accompanied witli a short description. The subject being of tfreat importance, both in an anatomical point of view, and in refer- ence to the classification of birds, the intestinal canal of a hiid of another family is here fio-ured and described. It has been seen tha
Edinburgh journal of natural history Edinburgh journal of natural history and of the physical sciences . edinburghjournal01macg Year: 1835 AND OF THE PHYSICAL SCIENCES. 14; DIGESTIVE ORGANS OF BIRDS. NO. II. Is the Number for May 1837, p. 94. was presented an outline of the digestive or- gans of the Red Grouse, Tetruo Scotictis, accompanied witli a short description. The subject being of tfreat importance, both in an anatomical point of view, and in refer- ence to the classification of birds, the intestinal canal of a hiid of another family is here fio-ured and described. It has been seen that the Grouse, and Gallinaceous birds in 'eneral, have an extra-thoracic dilatation of the oesophagus, or in other words a crop; a powerful muscular gizzard, lined with a dense and tough epidermis ; intes- tines of <'reat length ; and coecal appendages usually of a capacity equal to that of the intestine. In the birds of prey there is a different arrangement, which will be shown by the digestive organs of the Golden Eagle, Aqiiila Chrysaetus, here represented in outline. In this bird, which is carnivorous, the tongue, a, is short, emarginite, fleshy above, horny beneath towards the end, and papillate behind. There are numerous crypts along the sides of the tongue, beneath it and anteriorly to the glottis or aperture 'if the windpipe, which pour forth a viscid fluid, analogous to saUva. The hyoid bones, b, b, are seen in their natural situation. The oesophagus, c, d, is of great width, and on the fore-part of the neck, previously to its entering the thorax, is dilated into an extremely extensile sac, or crop, which has not a narrow aperture Uke the crop of the Gallinaceous birds, but is simply a dilatation of the oesophagus, having the same structure as it. Behind the crop, where it enters between the coracoid bones, the tesophagus is a little contracted ; and at its lower part enlarges to form the proventri- culus, g, g. At its upper part, the oesophagus has a thin layer o
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