PROGRESS OF MINUTE ANATOMY 95 
this plan, he made many dissections and drawings, but, at 
the age of sixty, on account of the condition of his eyes, 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 
Fic. 27.—The Brain and Head Nerves of the Same Animal. 
the Traité Anatomique. Lyonet died in 1789, at the age of 
eighty-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 
