Yn 99 Zw 



a. Respiratory enzymes of sea-urchin eggs. Strongylocentrotus purpuratus, 

 Lytechinus pictus (Echinoderms) 

 YNTEMA, C. L. Ph.D., Prof. — Dept of Anat.. School of Med., State 

 Univ. of New York, SYRACUSE 10, N.Y., U.S.A. 



a. Induction and differentiation of ear ectoderm. Amblystoma punctatum 

 (Amphibia) 



b. Regeneration of aneural limbs. Amblystoma punctatum (Amphibia) 



c. Development of autonomic nervous system. Gallus domesticus (Aves) 

 (in collaboration with W. S. HAMMOND) 



d. Effects of sulfa drugs on mammalian embryo. Mus musculus (in col- 

 laboration with W. S. HAMMOND) 



YOUNG, W. C. Ph.D., Prof. — Dept of Anat., Univ. of Kansas, Med. 

 School, LAWRENCE, Kan., U.S.A. 



a. Reproduction as influenced by hypothyroidism and hyperthyroidism in 

 both male and female guinea pig. Cavia porcellus (Mammals) 



b. Sexual behavior in the male guinea pig. Cavia porcellus (Mammals) 

 ZAAIJER, Miss J. J. P. Biol. Dra — Lab. for Exper. Histol., Fac. of Med., 



Univ. of Leyden, Wassenaarseweg, Boerhaavekwartier, LEIDEN, 

 Holland. 



a. Factors governing dentin formation. Mus musculus (Mammalia) 



b. Role of the odontoblasts in the formation of secondary dentin. Mus 

 musculus (Mammalia) 



ZAcWILICHOWSKA, Miss K. D.Sc. — Zool. Dept. of the Jagellonian 



Univ., KRAKOW (Cracow), St. Anne 6, Poland, 

 a. Early developmental stages of Asellus aquaticus L. (Crustacea) 

 ZEUTHEN, E. Dr Phil. — Lab. of Zoophysiology, Univ. of Copenhagen, 



Nat. Sci. Fac, Juliane Mariesvej 32, COPENHAGEN 0, Denmark. 



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

 cleavage period. (Echinodermata and Amphibia) 



b. Determination of desoxyribonucleic acid in eggs and embryos. (Am- 



ZUCKERMAN. S. M.A., M.D., D.Sc, M.R.C.S., L.R.C.P., F.R.S., Prof. 



— Dept of Anat., The Med. School, Birmingham Univ., Edgbaston, 



BIRMINGHAM 15, England, 

 a. Study of oogenetic function. Rodents, Monkeys and Ferrets (Mammals) 

 ZWILLING, E. Ph.D., Assoc. Prof. — Dept of Genet., Coll. of Agric, 



Univ. of Connecticut, Storrs Agric Exper. Stat., STORRS, Conn., 



U.S.A. 



a. Hypoglycemia following injection of insulin into chick embryos of 30 

 hours of incubation; relation to rumplessness and micromelia. Gallus 

 domesticus (Aves) 



b. Carbohydrate metabolism of insulin-treated chick embryos. Analyses 

 of embryo and yolk-sac membrane for glycogen, free sugar and total 

 carbohydrate. Gallus domesticus (Aves) 



c Effect of nicotinamide on growth retarding action of insulin in chick 



embryos. Gallus domesticus (Aves) 

 d. Analysis, by means of tantalum-foil blocking, of the development of the 



tail in chick embryos. Gallus domesticus (Aves) (in collaboration with 



Miss CRAIG) 



