Ilk. 2. 160 IIIc.3. 



M. Heteroploidy in mammals. Spontaneous heteroploidy — Ilia. 4. 



analysis of factors involved. Induced heteroploidy — Illb. 4. 

 methods of production. Viability of polyploid embryos. Hid. 1. 

 Physiological embryology of polyploid embryos. Mus 

 musculus. R. A. BEATTY and M. FISCHBERG 



Hybridization. 



T Hybridization in Tritucus alpestris and taeniatus. 



J. MOLL 



J. Parabiosis between pure breed and hybrids Urodela. Ilia. lb. 

 Tritums sps. A. PISANO' 



L. Intergeneric crosses in birds by means of artificial in- 

 semination. Gennaeus nycthemerus and Gallus domes- 

 ticus. J. H. MARCHLEWSKI 



Merogony. 



J. Merogony-experiments. Triton sp. E. H ADORN 



3. Analysis of influence of special genes and mutants in de- 

 velopment (incl. lethal factors). 



D. Developmental efforts of some genes in Drosophila 

 melanogaster (Insecta). C. H. WADDINGTON 



D. Developmental physiology and genetics of the lozenge 

 alleles in Drosophila melanogaster. G. ANDERS 



D. Development of eye pigmentation in wild type, aa and Ilia. 10. 

 wa wa Ephestia kuhniella (Lepidoptera). 



E. CASPARI 



D. Relations of genes in the development of eye colour in Ilia. 10. 

 Drosophila melanogaster. CI. W. CLANCY 



D. Development of a new peiotropic mutant "bordo- 

 sterile" in Drosophila melanogaster and the comparative 

 embryology of normal and "bordo-sterile" eggs. 



G. FABIAN 



D. Development of semilethals in Drosophila melanogaster. 



Frl. M. VOGT 



D. Developmental physiology and genetics of a lethal Illb. 2a. 

 mutant character in Drosophila melanogaster (lethal- 

 translucida). F. H. SOBELS 



D. Developmental analysis of lethal factors Drosophila sp. Hid. 2. 



E. HADORN 



D. Development of a lethal character in Drosophila mela- 

 nogaster (Insecta). H. GLOOR 



D. Entwicklung der Schuppen von Lepidopteren bei ver- 

 schiedenen Mutanten und unter experimentellen Be- 

 dingungen. Ephestia (Ptychopoda). A. KOHN. 



E. Recherches genetiques des races euphalliques et aphal- 

 liques chez Bulinus truncatus (contortus) (Gastropodes 

 Pulmones). M. de LARAMBERGUE 



J. Gene action controlling development of pigmentation in 

 white and dark strains of Mexican axolotl. Siredon 

 mexicanum. H. C. DALTON 



