103 



Symptoms. — In heavy infections there may be three more or less dis- 

 tinct periods of the disease, corresponding to the three stages in the 

 hfe cycle of the parasite; but these stages are obscure in light or in 

 repeated infections. Profuse sweating may last during the entire 

 attack. 



Period of ingression: The adiilt parasites are in the intestine, hence 

 gastro-intestinal symptoms develop; irregular appetite, nausea, diar- 



Fig. 34. 



Fig. 37. 



Fig. 32. 



Fig. 30. 



Fig. 33. 



Fig. 38. 



Fig. 32.- 

 FiG. 33.- 

 FlG. 34.- 

 FiG. 35.- 

 FiG. 36.-^ 



tinal canal. 

 Fig. 37.- 



fig. 16.) 

 Fig. 38.- 



2, flg. 1.) 



-Gravid adult female trichina. Enlarged. (After Leuckart, 1866a, pi. 1, flg. 2.) 



-Adult male trichina from the intestine. Enlarged. (After Leuckart, 1866a, pi. 1, flg. 5.) 



-External genitalia of same. Enlarged. (After Leuckart, 1866a, pi. 1, flg. 7.) 



-The same with extruded cloaca. Enlarged. (After Leuckart, 1866a, pi. 1, flg. 8.) 



-Cephalic portion of a trichina showing central nervous system and anterior portion of mte*- 



Greatly enlarged. (After Leuckart, 1866a, pi. 1, flg. 13.) 

 -Transverse section of a female trichina. Greatly enlarged. (After Leuckart, 1866a, pi. 1, 



.—Young trichina embryo in a muscle fibre. Greatly enlarged. (After Leuckart, 1866a, pi. 



