Deuchar 25 Dor 



b. Influence of the duration and direction of invagination of the organiser 

 on the nature of neural tissue induced. Triton alpestris (Urodela) (in 

 collaboration with C. H. WADDINGTON) 



c. Histochemical studies on ribonucleoprotein content of non-competent 

 ectoderm transplanted tot presumptive neural plate region. Triturus 

 alpestris (Urodela) (in collaboration with C. H. WADDINGTON) 



d. Studies on the permeability of undifferentiated and differentiated tissues, 

 using radioactive tracers. Various species (Amphibia) in collaboration 

 with J. DAINTY) 



e. Attempts to isolate proteins and protein derivatives from embryos by 

 ionophoresis. Various species (Amphibia) (in collaboration with G. G. 

 SELMAN) 



DEVILLERS, Ch. Dr es Sc. — Lab. d'Embryogenie comp., Coll. de France, 

 Place Marcelin Berthelot, PARIS Ve, France, 

 (no data received on Nov. 1^^ 1952) 



DIDING. S. Fil.mag. — Embryol. Dept, Zool. Inst, of the Univ. of Lund, 

 LUND, Sweden. 

 a. Study of the embryology. (Brachiopoda) 



DIERCKS. Fr. — Lab. voor Zool., Afd. Morphol., Universiteitstraat 14, 

 GENT, Belgie. 

 a. Action of alkaUne growth-promoting beef anterior pituitary extract on 

 regeneration of limbs and tail, with special consideration of ribonucleic 

 acid and alkaline phosphatase. (Urodela) (in collaboration with L. A. P. 

 DE CONINCK and J. M. DENUCE) 



DODD, J. M. B.Sc. — Gatty Marine Lab., The University. ST ANDREWS. 

 Fife. Scotland (U.K.) (no data received on Nov. 1^*. 1952) 



DOHRN, P. M.D., Ph.D. — Zool. Station, NAPLES, Italy. 



a. Analysis of the cytoplasmic fraction of the egg having ,,antifertih2in" pro- 

 perties. Arbacia lixula, Paracentrotus lividus, Sphaerechinus granulans, 

 Psammechinus microtuberculatus (Echinoidea) 

 h. Neurosecretory aspects of the eyestalks. (Crustacea) 

 c. Analysis of the interactions between jelly-coat substance and egg pro- 

 teins. (Echinodermata) (in cooperation with A. MONRO Y) 



DOHRN. R. Dr, Prof. — Zool. Station, NAPLES, Italy, 

 (no data received) 



DOLLANDER, A. Dr, Delegue Agr. — Lab. d'Histol., Dept d'Embryol.. 

 Fac. de Med., 31 Rue Lionnois, NANCY (Meurthe 6 Moselle), France. 



a. Etude des proprietes mecaniques des differents elements du cortex de 

 I'oeuf. (Amphibia) (en collaboration avec Miss G. LABADIE) 



b. Regulation de I'oeuf. (Amphibia) (en collaboration avec P. LEVAN 

 DIEM) 



c. Etude des proprietes de permeabilite du cortex de I'oeuf. (Amphibia) (en 

 collaboration avec P. J. MELNOTTE) 



DONALDSON, J. C. Ph.B., M.D.. Prof. — Dept of Anat.. School of Med.. 

 Univ. of Pittsburgh, PITTSBURGH 13. Pa. U.S.A. 

 a. Studies on the developing pancreas. Homo (Primates) 

 DONGEN, A. van — Zool. Lab. der Rijks Univ., Janskerkhof 3, UTRECHT. 

 Holland, 

 a. Development of the saccus vasculosus. Scijllhim stellare (Selachii) 

 DORP van VLIET, N. O. van B.Sc. — Zool. Lab. der Rijks Univ., Jans- 

 kerkhof 3, UTRECHT, Holland. 



