Pass 69 Penn 



PASSALACQUA, Miss A. Dr — 1st. di Zool., Via Archirafi 18, PALER- 

 MO, Italia, 

 a. Combined xenoplastic explantations of tail buds in Amphibians. 



PASTEELS, J. J. M.D., Agr. es Sci., Prof. — Lab. d'Anat. et d'Embryol.. 

 Fac. de Med. de l'Univ., 97, Rue aux Laines, BRUXELLES, Belgique. 



a. Centrifugation of amphibian blastula-gastrula. (Various sp. of Urodela 

 and Anura) 



b. General survey of turtle development. Chrysemis, Pseudemys and 

 Chelone 



c. Cytochemical observations on the first stages of Amphibia, various 

 species, (in collaboration with J. BRACHET) 



d. Photometric quantitative determinations of desoxyribonucleic acid 

 (D.N. A.) in resting cells, mitosis, spermatogenesis and development. 

 (Vertebrates) (in collaboration with L. LISON) 



e. The early development of Xenopus laevis from late neurula stage to 

 an advanced tail-bud stage (esp. morphological data for experimental 

 work). (Anura, Amphibia) (Normal Table) 



PATTEN, B. M. Ph.D., Prof. — Dept of Anat, Univ. of Michigan, Med. 

 School, 2500 East Med. Bldg, ANN ARBOR, Mich., U.S.A. 



a. Development of heart (especially later stages of its partitioning). 

 Developmental defects of heart (especially interatrial). Physiology of 

 embryonic heart (especially development of conduction system). Gallus, 

 Sus and Homo (Higher Vertebrates) 



b. Developmental defects of nervous system, particularly types involving 

 local overgrowth. Homo (Mammalia) 



PEACOCK, A. M.B., B.S., M.Sc, M.R.C.S., L.R.C.P. — Anat. Dept, 



London Hosp. Med. Coll., Univ. of London, Turner Str., LONDON 



E 1, England, 

 a. Investigation of development of vertebral column and intervertebral 



joints. Man (Mammals) 

 PEASE, D. C. Dr, Prof. — Dept of Zool., Coll. of Phys. and Surg., 



Columbia Univ., NEW YORK City, N.Y., U.S.A. 



(no data received) 

 PEERS, Miss D. }. — Dept of Entomol. and Zool., Ontario Agricultural 



College, GUELPH, Ont., Canada, 

 a. An investigation into the spawning habits and early development of 



Cyprinus carpio. (Osteichthyes) 

 PEHRSON, G. T. Dr Phil., Prof. — Zootom. Inst., Univ. of Stockholm, 



116, Drottninggatan, STOCKHOLM, Sweden, 

 a. Development and morphology of the skull and of the lateralis system. 



Osteoglossids and Characinids (Pisces) 

 PENNERS, A. Prof. — Zool. Inst, der Univ. Wurzburg, Naturw. Fak., 



Rontgenring 10, WURZBURG, Deutschland. 



a. Regeneration auf verschiedenen Altersstadien von Tubifex rivulorum. 

 (Clitella) (Oligochaeta) 



b. Cytochemische Untersuchungen der Oogenese und Spermatogenese von 

 Tubifex rivulorum. (Clitella) (Oligochaeta) 



c. Beeinflussung der Regeneration bei Tubifex rivulorum durch Naphta- 

 chinon und Phenanthrenchinon. (Clitella) (Oligochaeta) 



d. Entwicklung des Eies von Cyclops viridis unter Beeinflussung durch 

 Colchicin und Rontgenstrahlen. (Crustacea) 



