90 PRACTICAL ZOOLOGY. 



oviduct near its anterior end and insert a bristle tipped 

 with sealing-wax to discover where the oviduct ter- 

 minates anteriorly, and with what it connects at this 

 end. 



13. In the male, the yellowish testis corresponds to the 

 ovary. 



14. Connected with the ovary or testis are usually found 

 slender masses of fat. 



15. The kidneys are two long, deep red bodies alongside 

 the backbone, in the hind part of the body near the 

 cloaca. 



16. Insert a blowpipe through the mouth into the glottis 

 and inflate the lungs; observe their shape, and that 

 they are nearly hollow sacs, not spongy all the way 

 through as in the lungs of the rabbit or man. When 

 a lung has but few cells, only a small quantity of blood 

 can come into contact with the air. Such a lung is 

 adapted to an animal of low temperature and sluggish 

 habits. Tie a thread around each lung while it is 

 inflated ; cut the lungs out and hang them up to dry 

 thus expanded. When thoroughly dried, they may be 

 cut open and compared with the lungs of a turtle 

 similarly prepared. 



17. The thin sac inclosing the heart is the pericardium. 

 Carefully cut it away ; time the pulsations as seen in 

 a freshly killed specimen. What is the effect of 

 applying gentle heat to the heart, as by breathing 

 on it? The hinder conical part of the heart is the 

 ventricle; farther forward and nearer the back are 

 the auricles; running forward from the ventricle is 

 the main artery. This divides into two branches, 

 each of which has three subdivisions : 



