ix PARASITES IN MEAT 123 



C. HOW TO EXAMINE MEAT FOR TRICHINA SPIRALIS. 



(1) Place a small, thin piece of the suspected muscle on 

 a strong glass slide, and press another slide firmly down on 

 to the meat, in order to flatten it out in a uniform layer. 



Examine under the low power or with a dissecting 

 microscope : the capsules will be recognised at once 

 as small white points lying between the fibres. 



(2) Tease out a few fibres under the low power of a 

 dissecting microscope, and carefully separate the small white 

 bodies. 



Mount in Farrant's solution, and examine with low 

 and high powers. 



If the capsule of the trichina is calcified, add a few 

 drops of 10 per cent hydrochloric acid in order to 

 dissolve out the lime, wash and drain off the water, 

 and then mount in Farrant's solution. 



D. EXAMINATION or CYSTICERCUS OF EABBIT. 



(1) Carefully open the small cyst, and tease out its wall 

 in a drop of water under a dissecting microscope. 



(2) Search for the head or scolex, and free it as much as 

 possible from its attachments. 



(3) Drain off the superfluous water with a piece of blot- 

 ting-paper. 



(4) Mount in Farrant's solution, applying gentle pressure 

 bo the cover-glass, so as to flatten out the head. 



Examine under a low power. 

 Notice the suckers and hooks. 



