136 BACTERIOLOGY 



Collodion capsules are ordinarily placed free in the peritoneal 

 cavity of the animal, by an aseptic laparotomy. The wound is 

 sutured with silk or catgut and dressed with sterile cotton and 

 collodion. 



Observation of Infected Animals. In nearly every case it 

 will be well to keep a record of the weight of the animal from time 

 to time. The temperature may be observed by means of a 

 thermometer in the rectum. It should be inserted a considerable 

 distance, 4 to 8 centimeters in guinea-pigs. Other examinations 

 are made in special cases, such as palpation of the lymph glands 

 in tuberculosis and microscopic examination of the blood in an- 

 thrax, trypanosomiasis and the relapsing spirochetoses. 



The post-mortem examination of experimental animals has 

 been discussed (pages 98 and 100). 



