SPRATT, NT.. Jr. A.B.. Ph.D., F.I. I.E.. Prof. — Dept. of Zool.. Coll. of 

 Biol.Sci., Univ. of Minnesota, MINNEAPOLIS, Minn.55455, U.S.A. 



a. Investigating the nutrient requirements essential to morphogenesis and 

 growth in the early stages of development (pre-streak and streak blasto- 

 derms). Gallus domesticus (Aves) 



b. Survey of dehydrogenase enzymes in early embryos. Gallus domesticus 

 (Aves) 



1 . Localization of enzyme activity. 



2. Structural integrity and enzyme activity. 



c. Cytological study of the developmental center (organizer). Gallus do- 

 mesticus (Aves) 



d. Analysis of mechanism of morphogenetic movements by time-lapse 

 cinematography. Gallus domesticus (Aves) 



e. Analysis of dynamic population patterns (pattern formation by free- 

 swimming, ciliated and flagellated organisms). Tetrahymena spec, 

 Euglena spec. (Protozoa) , Arbacia punctulata (Echinoidea) 



f. Integrative mechanisms in early development. (Aves) 



g. Role of the microenvironment in cell differentiation. (Aves) 

 SPRINGER, Ch.A. M.S. — Dept. of Entomol., Frear Labs, Pennsylvania 



State Univ.. UNIVERSITY PARK. Pa. 16802, U.S.A. 

 a. Development of the neural elements in the central nervous system. Tria- 



toma sp., Cimex sp. and other spp. (Hymenoptera) 

 SREBRO, Z. A. D.M. — Dept. of Biol, and Embryol., Acad, of Med., ul. 



Kopernika 7, KRAKOW, Poland 

 SRINIVASACHAR, H. R. B.Sc. M.Sc. Ph.D. — Dept. of Zool.. Central 



Coll., BANGALORE 1, India 

 STAAL, G.B. Dr., Ir. — Lab. of Entomol, Agricult. Univ., Binnenhaven 7, 



P.O.B. 62. WAGENINGEN, Netherlands 

 a. Hormonal regulation of development, heteromorphosis and metamorpho- 

 sis. (Saturnidae. Lepidopteta) 

 STAGNI, Miss A. Dr., Prof. — 1st. di Zool., Via S.Giacomo 9, BOLOGNA, 



Italia 



a. Regeneration, origin of germ-cells and gametogenesis. Spirorbis pagen- 

 steched (Serpulidae, Polychaeta) 



b. Sex determination and sex differentiation. Chlorohydra viridissima 

 (Hydroidea) 



c. Cytochemical and electron microscopical study of oogenesis and sper- 

 matogenesis. Chlorohydra viridissima (Hydroidea) 



STALSBERG, H. Cand.med. — Anat. Inst., Univ. of Oslo. Karl Johansgt. 

 47, OSLO, Norway 



a. Extirpation of the epiphysis cerebri in the embryo. Gallus domesticus 

 (Aves) 



b. Hcmostasis in the embryo. Gallus domesticus (Aves) 



STAMPE, D. Dr.rer.nat. — Max Planck Inst. f. Meeresbiol., Anton Dohm 

 Weg, 2940 WILHELMSHAVEN, Deutsche Bundesrepublik 

 a. Mechanism of embryonic induction. Triturus spec. (Urodela) 

 h. RNA-metabolism in early development. Triturus spec. (Urodela) 

 STANCE, Miss L. Dr.rer.nat., Prof. — Inst, fiir Botanik, Techn. Hoch- 

 schule, Herrenhauser Str. 2, 3 HANNOVER, Deutsche Bundesrepublik 



193 



