212 



BIOLOGY AND ITS MAKERS 



in its less grotesque form, his discovery of the development 

 of the eggs of plant-lice without previous fertilization, his 

 researches on regeneration of parts in polyps and worms, 

 and other observations place him among the conspicuous 



Fig. 64. — Charles Bonnet, i 720-1 793. 



naturalists of the ])eriod. His system of philoso])]i}', which 

 has been carefully analyzed by ^^'hitman, is designated by 

 that writer as a system of negations. 



In 1 82 1, J. Fr. ^leckel, recognizing the great value of 



