THE CHICKEN. 



97 



plete diaphragm ; there is, however, a certain indepen- 

 dence of the two cavities, and a certain resemblance to 

 those we have studied. 



In the thoracic space are the heart, lungs, trachea, 



FIG. 51. 



BEAKS OF VARIOUS BIRDS. a, marabou stork ; 

 6, sparrow ; c, boatbill ; d, swordbill hum- 

 ming-bird ; e, species of thrush ; /, pelican ; 

 g, spoonbill; h, scissorbill; i, flamingo; j, 

 avocet ; A;, boatbill stork ; I, openbill stork ; 

 m, ibis ; n, condor ; o, merganser p, Columba 

 cenas; q, mycteria or saddle stork. 



FIG. 52. 



ALIMENTARY CANAL OP 

 FOWL. a, oesophagus; 6, 

 crop ; c, proventriculus, 

 or secreting stomach; d, 

 gizzard, or triturating 

 stomach ; e, intestinal ca- 

 nal; /, two long caecal 

 tubes indicating the theo- 

 retical commencement of 

 large intestine. 



and oesophagus, and in the lower cavity are the various 

 parts of the digestive apparatus, the liver, and the 

 kidneys. 



However, the apparatus that participate in the vari- 

 ous functions of nutrition and relation present marked 

 K g 9 



