226 



THE AMERICAN MONTHLY 



[December, 



and held by the central pin which 

 then revolves with the glass. A gen- 

 tle pressure causes the cutting point 



Fig. 52. 



tion of meat for the detection of 

 trichinae. It consists of two plates of 

 glass, between which the fragments of 



Fio. 53. 



to touch the glass, and perfect circles 

 can thus be readily obtained. 



The "Trichinoscope" is an instru- 

 ment devised for the ready exaniina- 



muscle are placed and pressed out 

 thin, by means of a screw. It is shown 

 open and closed in Figs. 52 and 53. 

 Above the upper plate there is a lens 



Fig. 54- 



