34: 



THE DISEASES OF DOMESTIC ANIMALS. 



It is not necessary to cleanse the glasses for each specimen to be 

 examined. 



To determine if the trichinae still live, place the object-glass over 

 heat — a spirit-lamp — for a second, enough to warm the slide, and 

 then place it under the microscope, and they will be seen to move 

 in their ca^^sules. 



Salted pork is best examined by cutting it into thin pieces and 

 soaking for a time, although the specimens can be at once placed in 

 water for a few moments. 



Objects which may be mistaken fob Tkichin^, or not eecog- 



nized as such. 



It not unfrequently happens that the capsules become abnor- 

 mally thickened, and the parasites dead within them. They do not 

 then present the same appearances that are generally observed under 

 normal conditions. 



Fig. 3. — Encapsuled Concretions 

 WITH Dead Embryos in them. 



Fig. 4. — Trichina -Capsules with 

 Calcified and Disintegrated Con- 

 tents. 



In other cases the calcification is of such a character as to almost 

 entirely change the appearance of both capsule and contents. 



Treatment of such capsules with hydrochloric acid will render 

 the diagnosis easier. 



