292 THE SCHOOL OF RlfiAUMUE, 



the same time, Trembley was prosecuting his studies 

 on the freshwater polyp, and Lyonet gave him some 

 friendly help. Those who care to turn to the preface of 

 Trembley's famous treatise (see p. 279) will see how 

 warmly Lyonet's services are acknowledged. He made 

 all the drawings, and engraved eight of them himself, 

 while Trembley is careful to note that he was not only 

 a skilful draughtsman, but an acute and experienced 

 observer. 



Lyonet complains in his preface that while he had 

 been engaged upon a Recueil Historique (apparently a 

 general account of Insects), others had managed to 

 publish interesting facts which he had discovered. He 

 resolved to set about a work of smaller compass, and 

 fixed upon the anatomy of the Goat-moth larva. Even 

 here he was anticipated by De Geer, whom he did not 

 consider a very formidable rival. After five years of 

 labour on the goat-moth larva, official work and intrigues 

 caused him to break off. Six more years passed, during 

 which he almost forgot the use of the burin ; then he 

 returned to his insect studies, and in two years and a 

 half completed the Traite Anatomique with its eighteen 

 beautiful plates. 



At the time when the Traite Anatomique was pub- 

 lished Lyonet meant to proceed with the description 

 of the pupa and imago of the goat-moth, and to trace 

 in detail the anatomical changes which accompany trans- 

 formation. He made some progress with the second 

 part, but found at the age of sixty that his eyesight 

 was impaired to such an extent as to make it impossible 

 to dissect or engrave any more. Twenty years later he 

 still hoped to put forth a volume of insect anatomy. 

 He had by him the materials collected for the second 

 part of the Traite Anatomique, the notes and drawings 



