103 



Si/mptoms. In heavy infections there may be three more or less dis- 

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

 life cycle 4 of Hie parasite; but these stages are obscure in light or in 

 repeated infections. Profuse sweating may last during the entire 

 attack. 



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

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



Fig.34. 



Fig. 35. 



Fig. 37. 



Fig. 32. 



Fig. 30. 



Fig. 33. 



Fig. 38. 



FIG. 32. Gravid adult female trichina. Enlarged. (After Leuckart, 1866a, pi. 1, fig. 2.) 



FIG. 33. Adult male trichina from the intestine. Enlarged. (After Leuckart, 1866a, pi. 1, fig. 5.) 



:vl. - Kxionial gf'nitalia of same. Enlarged. (After Leuckart, 1866a, pi. 1, fig. 7.) 

 FK;. :>."). Tlu> sumo with extruded cloaca. Enlarged. (After Leuckart, 1866a, pi. 1, fig. 8.) 

 1 '!<;. 36. Cephalic portion of a trichina showing central nervous system and anterior portion of intes- 

 tinal canal. (Jrcatly enlarged. (After Leuckart, 1866a, pi. 1, fig. 13.) 



FIG. 37. Transverse section of a female trichina. Greatly enlarged. (After Leuckart, 1866a, pi. 1, 

 fig. Ifi.) 



FK,. as.- Young trichina embryo in amuscle fibre. Greatly enlarged. (After Leuckart, 1866a, pi. 



