Holt 43 Hub 



HOLTER, H. Ph.D. — Cytochem. Dept, Carlsberg Lab., 8 GI. Carls- 

 bergvej, COPENHAGEN Valby, Denmark, 

 a. Enzyme development in embryos. (Echinodermata) 



h. Study with Cartesian divers of mitotic rhythm in metabolism during 

 cleavage period. (Echinodermata and Amphibia) (in collaboration with 

 E. ZEUTHEN) 

 HOLTFRETER, J. K. F. F.I. I.E., Ph.D.. Prof. — Department of Biology, 

 College of Arts and Sciences, University of Rochester, ROCHESTER 3, 

 N.Y., U.S.A. 



a. Effects of carcinogens on successive developmental stages of embryos. 

 Amby stoma (Urodela), Rana pipiens and Xenopus laevis (Anura) 



b. Relationship between size of inductive graft and size and pattern of 

 induction. Ambystoma (Urodela) and Rana (Anura) 



HOLTZER H. Ph.D. — Dept of Anat.. School of Med., Univ. of Pitts- 

 burgh, PITTSBURGH 13, Pa, U.S.A. 



a. Development of regional functional properties in the spinal cord, tested 

 by defect and transplantation experiments. (Urodela) 



h. Selectivity in outhgrowth and terminations of embryonic nerves. (Ver- 

 tebrata) 



c. Role of the spinal cord in the morphogenesis of the vertebral column. 

 Ambystoma (Urodela) 



d. Factors influencing the organization of the neural action systems in 

 the brachial spinal cord. Ambystoma (Urodela) 



HOOKER D. Ph.D., Sc.D. (Hon.), Prof. — Dept of Anat., School of Med.. 

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



a. Study of the physiological responses of fetuses. Homo (Primates) 



b. Study of the reactivity of the fetus to exteroceptive stimulation. Homo 

 (Primates) 



HORN E. C. B.S., A.M., Ph.D., Prof. — Dept of Zool., Duke Univ.. DUR- 

 HAM. N.C.. U.S.A. 

 a. Organogenesis during development and changes at metamorphosis. 



Ichthyomyzon (species undescribed) (Cydostomata, Pisces) 

 h. Tail regeneration in Ammococtes. Ichthyomyzon (Cydostomata, Pisces) 

 HORSTADIUS, S. F.I. I.E., Fil.Dr. Prof. — Zool. Inst.. Uppsala Univ., 

 UPPSALA. Sweden. 



a. Determination in the egg: Analysis of the gradients and the processes 

 behind them. (Echinoidea) 



b. Determination within the head. Ambystoma (Urodela) 



HO TSE YING. Miss B.Sc. — Lab. of Developm. Physiol., Inst, of Exper. 



Biol.. Acad. Sinica, 865 Chang Ning Rd, SHANGHAI. China. 



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

 HOWORKA, E. I. M.D., Ph.D. — Klinika Ginekologiczna Poznan, Polna 



33, POZNAN, Poland. 



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

 HUBER, W. Dr es Sc. — Lab. de Zool. de la Fac. des Sci. et Lab. 



d'Embryol. et Teratol. exper. du C.N.R.S., Inst, de Zool. et de Biol. 



gen., 12 Rue de I'Universite, STRASBOURG, France, 

 a. Developpement de la tete. Etude morphologique et experimentale de 



developpement de la forme encephalique en rapport avec le crane; cour- 



bure et redrcssement de la tete; position des yeux. Analyse de races a 



forme encephahque abcrrante. Gallus domesticus (Aves) 



