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 extremely line 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- 



Fig. 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 



