s:* OF THE PRINCIPAL WORMS 



scope, we see it filUd with iniiiiraerahle embrios 

 ilisteiuled in various forras.(f 8ii) The figure of 

 these embrios seems to be oval.(t8R) 



The extraordinary quantity of fetuses in the fe- 

 male ascaris vermicularis need not be at all sur- 

 prising, since tliese worms, according to the obser- 

 vations of Goeze, are viviparous ;(i87) the fe- 

 male expelling very small ascarides in a living 

 state, after which she dies. (188) 



Thus the opinion of Kratzenstfin is equally re- 

 futed, (18i)) who pretended that the flies, habituat- 

 ed to draw food from excrements, deposited their 

 eggs in the anus of children, and in this manner 

 gave rise to these worms. 



FIFTH GENUS. 



.LUMBinCOlDES. 



§ XLIII. Naturalists are no where so much 

 divided in their opinions as on this worm. 



Linnaeus{i90) reduced to the same species the 

 lumbricus terrcstris with that which inhabits our 

 intestines, and for this reason Vallisneri called this 

 worm lumbricus humaiius, and we more convenient- 

 ly have called it lumbrico"ides.(191) It has been 

 sufficiently demonstrated that these two worms 

 are strikingly different, in regard to the external 

 structure of their bodies,(f9S) as well as in rela- 

 tion to their internal organs. (193) 



The opinion of Linnaeus and of the writers 

 ivliQ have copied him is greatly erroneous, as is that 



