344 ENTOZOA. 



takes place after tlie transportation of impregnated Trichinge into 

 the intestines of a new liost." 



13. " Tlie further development of the muscle-Trichinae into 

 sexually-mature animals, is altogether independent of the forma- 

 tion of the calcareous shell, and occurs as soon as the former have 

 reached their completion." 



14. " Male and female individuals are already recognizable in 

 their larval state." 



15. " The immigration of the Trichina-brood in masses pro- 

 duces very grave, or even fatal consequences ; peritonitis (fi^om the 

 embryos perforating the intestinal walls), pain, and paralysis (from 

 the destruction of the infected muscular fibres)." 



16. " In proportion to the quantity of imported parasites, the 

 eating of trichinous meat is also attended with more or less 

 dangerous symptoms (or even death) as its consequence ; enteritis 

 with exudation of a croupy mass which is sometimes thrown off in 

 flakes (in rabbits and rats), sometimes in pus-bodies (in the cat 

 and mouse), or (in the dog) becomes converted in psorospermi^." 



Medical importance of the Trichina. — Having thus sketched, in 

 the briefest possible manner, the leading facts connected with the 

 genesis and development of this minute parasite, I proceed, in 

 accordance with my previous promise, to speak of the peculiar 

 helminthiasis resulting from its invasion of our bodies. Even at 

 so late a period as that at which the Sydenham Society issued Dr. 

 Lankester's translation of Kiichenmeister's "Manual" of the 

 human parasites, we find it stated that " the immigration of the 

 brood of Trichina appears to take place without any general 

 reaction, as it is also borne without injury for many years" by the 

 infected person ; and, it was not until the publication of Zenker's 

 oft-quoted and well-known case of Trichina-disease, that the 

 medical profession became aware of the fact that this tiny parasite 

 was capable of producing disease and death. As has often 

 happened in the instance of other important discoveries, Zenker's 

 fatal case not only, as it were, re-stirred up the experimental hel- 



