288 THE SCHOOL OP R:eAUMUR 



eggs are fertilised.^ Bazin of Strassburg, Trembley and 

 Lyonet were all invited by Reaumur to repeat Bonnet's 

 experiments, and all three got confirmatory results, 

 as did E^aumur himself, though his trials were less 

 complete. Long afterwards it became known that as 

 early as 1701 Albrecht of Hildesheim had observed 

 reproduction in an unfertilised moth.^ He had picked a 

 brown pupa from a currant-bush, and placed it in a glass 

 vessel. A yellowish-white moth emerged, which was 

 left all winter without attention. In the following 

 April Albrecht was astonished to find that the eggs 

 of this moth had hatched, and produced a number of 

 small black caterpillars. 



The Multiplication of Worms hy Section 



In Part II of the Traite d' Insectologie Bonnet tells 

 how he searched without success for the freshwater 

 polyp according to the indications furnished by Trembley. 

 A long aquatic worm was however found, and upon this 

 the experiment of section into two (suggested by 

 Trembley 's work on Hydra) was tried ; each piece became 

 a complete worm. In the end Bonnet succeeded in 

 cutting a worm into twenty-six parts, most of which 

 yielded complete individuals. He believed that he 

 had experimented on six diff'erent kinds of worms ; 

 Nais does not appear to have been one, in spite of 

 statements to the contrary, which are frequent in 

 text-books. Bonnet takes to himself the credit of 

 these observations, but it is plain that it was not he 

 but Lyonet who first showed that there are worms 



1 See also Trembley, Polype d'eau douce, preface, p. xi, which shows that 

 Lyonet had anticipated some of Bonnet's conclusions. 



The case is reported by Siebold in his Wahre Parthenogenesis, p. 16 

 (1856). 



