a Study of induced metamorphosis: histological maturity and the development of tissue 



sensitivity to thyroid hormones in the embryo; biochemical changes evoked by thyroid 



hormones in embryonic and adult susceptible tissues. Ambystoma mexicanum, A. tigrinum, 



Necturus maculosus (Urodela) 



b Comparative study of hypothalamo-pituitary-thyroid axis in pre- and post-metamorphic 



animals. Ambystoma mexicanum, A. tigrinum, Necturus maculosus (Urodela) 

 c Biochemical and morphological effects of thyroid hormones on embryonic tissues. Xenopus 



laeuis (Anuca) 

 PRASAD, M. R. N. Ph.D., Prof. — Dept. of Zool., Univ. of Delhi, DELHI-7, India 

 a Action mechanism of hormones on nucleic acid and protein synthesis in the blastocyst. 



Rattus spec, Mesocricetus auratus (Rodentia) 

 PRATT, C. W. McE. M.D. — Anat. School, Univ. of Cambridge, Downing St., CAM- 

 BRIDGE CB2 3DY, England 

 a Development of skeletal tissue 

 PRAY, T. R. Ph.D., Prof. — Dept. of Biol. Sci., Univ. of S.California, University Park, 



LOS ANGELES, Calif. 90007, U.S.A. 

 a Development of the gametophytes and juvenile stages of the sporophytes (Cheilantheae, 



Ptecidaceae, Filicinae) 

 b Development of the vein systems of leaves. Anemia spec, Marsilea spec, Cyrtomium 



spec, Acrostichum spec and other spp. (Filicinae) 

 c Factors controlling planes of cytokinesis in early gametophyte development. Cheilanthes 



spp. (Ptecidaceae, Filicinae) 

 PREDA, V. G. M.D., Prof. — Cat. de Biol.-Histol., Inst, de Med. s.i Farmacie, St. Pasteur 6, 



CLUJ, Rumania 

 a Influence de la temperature d'incubation sur Infrastructure et l'immunomorphologie de 



l'embryon. Gallus spec (Aves) 

 b Affrontation d'organes embryonnaires in vitro. Rattus spec (Rodentia) 

 c Action de 1 hormone gonadotrope choriale sur la differenciation sexuelle. Zea mays, 



Cannabis sativa (Angiospermae) 

 PRESLEY, R. M.B., B.Chir. — Dept. of Anat., Univ. Coll., Cathays Park, CARDIFF CF1 



3NR, Wales, U.K. 

 a Ultrastructure of embryos. Various spp. (Rodentia) 



b Fertilization; kinetics and nature of block to polyspermy. (Echinodermata) 

 c In vitro development of peripheral elements of embryonic autonomic nervous system 



(ultrastructure, histochemistry, pharmacology). Gallus domesticus (Aves), (Rodentia) 

 d Effects of oestrogen and progesterone on uterine environment and blastocyst in delayed 



implantation. Rattus spec. (Rodentia) 

 PRESS, N. Ph.D., Prof. — Dept. of Zool., Univ. of Wisconsin, MILWAUKEE, Wis. 53201, 



U.S.A. 

 PRESTIGE, M. C. M.A. —Physiol. Dept., Med. School, Univ. of Edinburgh, Teviot Place, 



EDINBURGH EH8 9AG, Scotland, U.K. 

 a Development of neuromuscular apparatus of hind limb: differentiation of nerve cells, 

 electron microscopy of fibres, autoradiographs of neuronal birthday, development of 

 connections, possibility of disconnections. Xenopus laevis (Anuva) 

 PRESTON, T. M. B.Sc — Dept. of Zool. and Comp. Anat., Univ. Coll. London, Gower 



St., LONDON WC1E 6BT, England 

 a Morphogenesis. Naegleria gruberi (Rhizopoda) 



PRICE, Miss D. Prof.(Emer.) — Dept. of Biol., Div. of Biol. Sci., Univ. of Chicago, 1101 

 E. 57th St., CHICAGO, 111. 60637, U.S.A. • 



PRIESTER, W. de M.Sc — Zool. Lab., Univ. of Leiden, Kaiserstr. 63, LEIDEN, Nether- 

 lands 

 a Electron microscopy of developmental stages. Calliphora ecythrocephala (Diptera) 

 PRINS, G. H. Drs. — Dept. of Med. Anat. and Embryol., State Univ. of Utrecht, Janskerk- 



hof 3A, UTRECHT, Netherlands 



a Aetiology and pathogenesis of Hirschsprung's disease and comparable disorders, normal and 



abnormal development of intramural ganglia in colon and rectum; probable causes and 



prevention. Gallus domesticus (Aves), Rattus spec. (Rodentia), Homo sapiens (Primates) 



b Maternal influences (various diseases, pharmaca, nutrition etc) on fetal development; 



birth influences on neonate. Gallus domesticus (Aves), Rattus spec, Mus musculus 



(Rodentia) , Homo sapiens (Primates) 



PRINS, H. J. — Anat.-Embryol. Inst., Univ. of Amsterdam, Mauritskade 61, AMSTERDAM- 



O., Netherlands 

 a Analysis of fracture repair. Ambystoma mexicanum (Urodela) (with H. A. L. TRAM- 



PUSCH) 

 PRITCHARD, D. J. B.Sc. — Inst, of Anim. Genet., Univ. of Edinburgh, West Mains Rd., 



EDINBURGH EH9 3JN, Scotland, U.K. 

 a The role of cell surface determinants in tissue organization and interaction. Mus musculus 



(Rodentia) 

 b The biochemical basis of abnormalities in eye development. Same species as a 



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