of the Ardea Argala, the Casuarius Emu, &c, 79 



meter, and the intestine afterwards continues nearly of that 

 size. 



In the long-legged casowary from New South Wales, the 

 solvent glands are of the same length as those of the Emu, 

 but are twice the width ; they occupy the whole surface of the 

 cardiac cavity, in the middle line of which there is a row of 

 these glands in the direction of the cavity, and on the two 

 sides the glands are arranged in an oblique direction towards 

 this line. The gizzard is rather stronger than in the Emu, 

 but resembles it in all other respects. The duodenum at its 

 origin is by no means so large. 



The annexed drawings (See Plates IV. V.) shew all the 

 parts in so distinct a manner, as to make a more particular 

 description of them unnecessary; and I feel myself much 

 indebted to the kindness of Mr. Howship, who, in the ab- 

 sence of Mr. Clift, took the trouble of making them. His 

 knowledge of comparative anatomy has enabled him to exe- 

 cute them in a much more satisfactory manner than could 

 have been done by any artist who was not at the same time 

 an anatomist. 



It is a very interesting part of comparative anatomy to ex- 

 amine the digestive organs belonging to birds, between which 

 there is a similarity in size, food, and habits of life ; and to 

 trace the varieties in structure by means of which each spe- 

 cies is enabled to subsist upon the produce of the country, of 

 which it is the natural inhabitant, with every possible advan- 

 tage. This cannot be better illustrated than by the following 

 examples. 



The Casuarius Emu, a native of Java, one of the most fer- 

 tile and luxuriant islands in the world, has the solvent glands 



