34 



THE DISEASES OF DOMESTIC ANIMALS. 



It is not necessary to cleanse the glasses for eacli 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 capsules. 



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 foe Trichinae, or not recog- 

 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. — Encapscled 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. 



