PROGRESS OF MINUTE AX ATOMY 



95 



this plan, he made many dissections and drawings, but, at 

 the age of sixty, on account of the condition of his eves, he 

 was obliged to stop all close work, and his project remained 

 unfinished. The sketches which he had accumulated were 

 published later, but they fall far short of those illustrating 



Fig. 27. — The Brain and Head Nerves of the Same Animal. 



the TraitS Anatomique. Lyonet died in 1789, at the age of 

 eightv-one. 



Roesel, Reaumur, and De Geer on Insect Life. — We must 

 also take note of the fact that, running parallel with this work 

 on the anatomy of insects, observations and publications had 

 gone forward on form, habits, and metamorphosis of insects, 

 that did more to advance the knowledge of insect life than 



