investigator in the questions, their decisions later on 

 were registered by foreign authors (466) . 



(116) The reproduction phenomena, closely connected 

 with the embryonic development, already attracted Baer's 

 attention for a long time. He followed the corresponding 

 literatures and performed some small investigations, con- 

 cerning reproduction of different organisms. He published 

 on this subject the following reports: 



1) Selbstbefruchtung an einer hermaphroditischen 

 Schnecke beobachtet, Arch. Anat., Physiol., 1825, S. 224; 

 2) Doppelter Muttermund des einfachen Fruchthalters vom 

 Ameisenfresser, Ibid., 1836, S. 384; 3) Uber mehrfache Formen 

 von Spermatozoen in denselben Thiere, Bull. phys. math. Ac. 

 Sc. st. Peterb. 5, No. 15, 1847, S. 230; 4) Zusatz. zu 

 Dr. J. F. Weisse's Aufsatz: Ueber die Vermehrungsweise des 

 Chlorogorium euchlorum, Ibid., 6, No. 20, 1847, S. 315-317; 

 5) Ueber Herrn Steenstrup's Untersuchungen betreffend das 

 Vorkommen des Hermaphroiditismus in der Natur, Froriep 

 Notizien, III Reihe, 1, 1847, S. 129-135 (467). 



(117) Between I. I. Mechnikov and M. S. Ganin a lively 

 discussion took place. In its course, they both approved of 

 Baer's authority, turned to him by letters, also published 

 at that time. Recently A. D. Nekrasov touched the argument 

 of Mechnikov with Ganin in the article "First embryological 

 work of I . I . Mechnikov and the discovery of pedogenesis in 

 cecidomie by Nikolay Wagner" (Trudy In-ta istorii estestvozn. 

 V. IV, 1952, pp. 315-324) (474). 



(118) This name was suggested by Hexly before Leikart, 

 although he could not give signs, which essentially differen- 

 tiate the true ova from false ones. Later on, Zalenskii with 

 certainty showed, that between "false ova" of cecidomie and 

 ova of other insects, there was no principal difference (Trudy 

 3-go S'ezda Russkikh Estestvoispytatelei v Kiev. 1872) (474) . 



(119) Baer, however, held a similar point of view but 

 not completely successful. In this connection, it is possible 

 to have an assurance if you remember that he has assumed the 

 existence of an intermediate form between types (see, for 



647 



