Post-mortems 2 1 9 



minims of liquid into the pleural cavity of a mouse is " much 

 the same as if one would inject through a fire-hose three or 

 four quarts of some liquid into the respiratory organs of a 

 man." 



Fig. 63 Mouse-holder'. 



When desired for experiments, the blood of animals can 

 best be secured from the jugular vein. From small animals, 

 such as rabbits and guinea-pigs, it may be secured by intro- 

 ducing a small cannula into the carotid artery, if the animal 

 is to be kept alive, or by anesthetizing the animal, exposing 

 the heart, cutting a small opening into a ventricle, and suck- 

 ing up the blood with a pipet introduced through the open- 

 ing. The blood of mice and rats can thus be secured. 



Post=mortems. Observation of experiment animals by 

 no means ceases with their death. Indeed, he cannot be a 

 bacteriologist who is not already a good pathologist and ex- 

 pert in the recognition of diseased organs. 



When an autopsy is to be made upon a small animal, it is 

 best to wash it for a few moments in a disinfecting solution, 

 to kill the germs present upon the hair and skin, as well as 

 to moisten the hair, which can then be much more easily 

 kept out of the incision. 



Small animals can be tacked to a board or tied, by cords 

 fastened to the legs, to hooks soldered to the corners of an 

 easily disinfected tray. The dissection should be made with 



