152 PARASITES OF MAN 



Klencke' s claims, the same observer writes : " Klencke has 

 asserted that he had already drawn Trichinae in the year 1829, 

 and that he had seen them again in 1831. This subsequent 

 statement has no kind of confirmation. The unreliableness, 

 mistakes, and self-deceptions in the helminthological writings of 

 Klencke have been repeatedly exposed some twenty years ago." 

 Prior to this criticism by Pagenstecher, Professor von Siebold 

 and several other well-known helminthologists had already com- 

 mented on Klencke' s assertions in the same destructive manner. 

 In regard to the experimentation and the valuable instruction 

 thus acquired, it appears tfaaJLHerbst was the first 

 to rear muscle-flesh-worms, or encapsuled Trichinae, 

 in animals (1850) ; whilst Virchow was probably the 

 first to rear and recognise sexually-mature intestinal 

 Trichinae in a dog ('Deutsche Klinik/ 1859, s. 430) ; 

 yet, without doing injustice to others, it must be 

 added that it remained for Prof. Leuckart to offer a 

 full, complete, and correct solution of the principal 

 questions relating to the source and mode of genesis 

 of the flesh-worm (1860). Leuckart likewise did 

 good service by disproving the erroneous views 

 that had been put forth by Kuchenmeister. Lastly, 

 all these brilliant results culminated in the clinical 

 observations of Zenker, who opened out a new 

 epoch in the history of trichinal discovery. Pro- 

 fessor Zenker was the first to detect the young in 

 the act of migration, and he likewise primarily 

 demonstrated the fact that the larval parasites 

 were capable of producing a violent disease in the 

 human body. 



x-**"~"Never in the history of biological science have 

 more valuable issues followed the method of expe- 

 riment upon animals. Not only has human life 

 been thus saved, but animal life also. State- 

 medicine and sanitation have received an immense 

 impulse. The good that has already resulted is 

 simply incalculable ; nevertheless, in the eyes of a 

 set of ignorant fanatics who infest this country, 

 all experiments " involving cruelty to animals " 

 35 sexually ou g^ * be prevented at any cost. The further 

 ^'nS? P r g ress f biological science in England has 

 After Leuckart. hereby sustained a severe check. 



