Nieuwkoop 92 Os 



Regulation potencies in the neural plate. Formation of neural crest 



by regulation after implantation of young neural plate tissue in the 

 ventral side of neurulae, or by homogenetic induction after implan- 

 tation in middle gastrulae (heteroplastic transplantation). Triturus 

 taeniatus, alpestris and cristatus. Ilia. lc. J. 



(in collaboration with Miss M. BOUMAN and B. de PLANQUE) 



Analysis of the neural induction. Transfer of inductive substances 



in horizontal direction through the presumptive, neural plate, (hete- 

 roplastic transplantation of ectoderm). Triturus taeniatus, alpestris 

 and cristatus. Ilia- 7. J. 



(in collaboration with Miss A. KREMER and Miss E. BOTERENBROOD) 



Analysis of the neural induction. Separation of archenteron roof 



and overlying ectoderm by semipermeable membranes. Triturus 

 taeniatus and alpestris. Hlb. 7. d. J. 



NIL!, M. C. (data not yet received). 



NOEL, Miss E. Effect of metabolic analogs on morphological and bio- 

 chemical development. Amblystoma punctatum and Rana pipiens. 

 (under direction of E. J. BOELL) Hlb. 2a. e. J. 



NOVIKOFF, A. B. Biochemical and cytochemical properties of rapidly 

 growing tissue — normal (i.e., controlled) and autonomous growth 

 (tumors). Rat. Hid. 5. M. 



NtlESCH, H. Phanotypische Geschlechtsbestimmung. Planaria (Tur~ 

 bell.) and Lymnaea (Gastr.). IIIc. lb. C. and E. 



ODfi, Miss E. Development of aorta, art. pulmonalis and ductus Bo- 

 talli. Mammals. I. 15. M. 



OLIVO, O. M. Electrophysiology of embryonic heart tissue. Gallus 

 gallus. Illb. 15. d. L. 



OLSSON, R. Development and anatomy of the nuclei and nerve fibres 

 in the brain. Polypterus (Brachiopterygii). II. 9. I. 



OORT, J. Development of the anterior hypophysis of the black-headed 

 gull. Latus ridibundus. I. 18. L. 



OPPENHEIMER, J. M. (data not yet received). 



ORLANDI, Miss A. Development of nucleoproteins. Aves and Am- 

 phibia. Illb. 2c. c. V. 



ORLOWSKI, A. The influence of hormones on metamorphosis. Ver- 

 tebrates(?). V. 2. f. V.(?) 



(in collaboration with A. BER) 



ORSKA, Miss J. Development of the vertebral column centra in Te- 

 leosts. Salmonidae and Cyprinodontidae. II. 11. I. 



ORTS — LLORCA, F. Embryology of birds and mammals. 



I. 2a. L. and M. 



OSTERTAG, Mile Y. La genese de l'asymetrie du tractus genital des 

 oiseaux et la regression des canaux dc Muller. Gallus domesticus. 



Ilia. 17. L. 



Role des hormones dans la differenciation du sexe par les methodes 



d'injections d'hormones, des greffes coelomiques, des castrations 

 embryonnaires, des explantations. Poulet. Illb. 17. f. L. 



(en collaboration avec Et. WOLFF, Madame Em. WOLFF et G. STRUDEL) 



