146 SEVENTEENTH CENTURY. ft. hi. 



immense number of observers in the same line of study. I 

 have picked out those whose work you could best under- 

 stand, and whose names ought to be known to you ; but I 

 could have selected not four but forty others who ought to 

 have been mentioned, if my book and your knowledge had 

 been greater. We must be content to catch here and there a 

 glimpse of the advance that was being made, always remem- 

 bering that an almost inexhaustible store of further infor- 

 mation remains behind when we have opportunity to seek 

 for it. 



Chief Works consulted. — Cuvier, 'Hist, des Sciences Naturelles ; * 

 Carpenter's * Physiology ; ' Sprengel, * Histoire de la Medecine ; ' 

 Whewell's ' History of Inductive Sciences ; ' Carpenter, * On the Micro- 

 scope ; ' * Memorial of John Ray,' E. Lankester, 1846 ; * Life of Ray 

 and Willughby,' Naturalists' Library, vol. xxxv. ; Lardner's * Encyclo- 

 paedia ' — Classification of Animals. 



