288 THE SCHOOL OF REAUMUR 



eggs are fertilised. ^ Bazin of Strassburg, Trembley an( 

 Lyonet were all invited by Reaumur to repeat Bonnet' 

 experiments, and all three got confirmatory results, 

 as did Reaumur 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 wi 

 left all winter without attention. In the followin| 

 April Albrecht was astonished to find that the eggs 

 of this moth had hatched, and produced a number oi 

 small black caterpillars. 



The Multiplication of Wor7ns hy Section 



In Part II of the Traite dJ Insectologie Bonnet tell 

 how he searched without success for the freshwate:| 

 polyp according to the indications furnished by Trembleyj 

 A long aquatic worm was however found, and upon thi 

 the experiment of section into two (suggested b] 

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

 a complete worm. In the end Bonnet succeeded ii 

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

 yielded complete individuals. He believed that h< 

 had experimented on six different kinds of worms? 

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

 statements to the contrary, which are frequent i] 

 text-books. Bonnet takes to himself the credit 

 these observations, but it is plain that it was not h^ 

 but Lyonet who first showed that there are woi 



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

 Lyonet had anticipated some of Bonnet's conclusions. 



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

 (1856). 



