LEEUWENHOEK 223 



tissues or infusions, they had always been really intro- 

 duced from without. He had no doubt of the fixity 

 of species, and expressed himself in language very 

 similar to that employed by Linnaeus in the next 

 generation : — " Omnia animalcula," says Leeuwenhoek, 

 "quantumvis vilia ac despecta, originem suam debent illis 

 animalculis, quae initio rerum creata fuere, iisdemque 

 gaudent perfectionibus." ^ 



'■Gont. Arc. Nat., Epist. 121 (argumentura). 



