94 BIOLOGY AND ITS MAKERS 
exhibiting the nervous ganglia, the air tubes, and muscles of 
the head in their natural position. 
Fig. 27 shows the nervous system of the head, including 
the extrernely fine nervous masses which are designated the 
sympathetic nervous system. 
The extraordinary character of the drawings in Lyonet’s 
monograph created a sensation. The existence of such com- 
plicated structures within the body of an insect was dis- 
Fic. 26.—Dissection of the Head of the Larva of the Willow Moth. 
credited, and, furthermore, some of his critics declared that 
even if such a fine organization existed, it would be beyond 
human possibilities to expose the details as shown in his 
sketches. Accordingly, Lyonet was accused of drawing on 
his imagination. In order to silence his critics he published 
in the second edition of his work, in 1752, drawings of his 
instruments and a description of his methods. 
Lyonet intended to work out the anatomy of the chrysalis 
and the adult form of the same animal. In pursuance of 
