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a. Study of water metabolism in embryonic development. Huso huso, Aci- 

 penser giildenstadti, A. stellatus (Acipenseridae, Chondtostei) , Salmo 

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b. Energetics of fertilization, cleavage and gastrulation. (Pisces; Amphibia) 

 ZWILLING, E. Ph.D., F.I. I.E. — Dept. of Biol, Brandeis Univ., WALT- 

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a. Disaggregation and reaggregation of early embryos. Effects on differen- 

 tiation. Gallus domesticus (Aves) 



b. Culture behaviour of early embryonic tissues. Gallus domesticus (Aves) 



c. Ectoderm-mesoderm interaction in limb development. Gallus domesticus 

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ZWIRNER, R. Dr.Med. — Heiligenberg-Inst, (17b), HEILIGENBERG, 

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