LIFE HISTORIES. 



193 



Some of the most Important Forms Parasitic in Man. 



Trichina. The formidable Trichina deserves fuller notice. It is best 

 known as a parasite in man, pig, and rat, but occurs also in hedgehog, 

 fox, marten, dog, cat, rabbit, ox, and horse. The sexual forms live in 



'3 



