120 PRACTICAL ZOOLOGY. 



made, and showing by an arrow the direction in 

 which the rabbit was going. 



3. Observe the "whiskers" on the upper lip. Examine 

 the nostrils and the cleft in the upper lip. 



4. Note the chisel-shaped front teeth, the incisors; ob- 

 serve the space between the incisors and the grinding 

 teeth, or molars. 



5. Observe the hairiness of the inside of the cheek. 



6. Find the third eyelid. How does it compare with 

 that of the pigeon ? 



7. Save a few of the hairs, and later examine them under 

 the microscope. 



INJECTION OF THE RABBIT. 



Before beginning dissection it is well to have at least 

 one specimen injected for the sake of comparison. The 

 method of injecting recommended by Parker ("Zootomy") 

 has given good results. Kill a rabbit with chloroform ; 

 as soon as it is dead, open the thorax by cutting through 

 the sternal ribs of both sides, sufficiently far from the 

 middle line not to injure the mammary arteries; cut 

 across the posterior end of the sternum, and turn it for- 

 ward ; slit open the pericardium, and make a large incision, 

 by a single cut with the scissors, in each ventricle ; all this 

 should be done very rapidly, if possible before the heart 

 has ceased to beat, as it is desirable to get rid of as much 

 blood as possible; pass a ligature round the aorta close to 

 its exit from the heart, and give it a single loose tie ; when 

 the bleeding has ceased, sponge the blood from the heart, 

 and pick away any clots that may have formed in the left 

 ventricle ; pass a cannula through the incision in the left 



