Sob 85 Stark 



SOBELS. F. H. M.Sc. — Zool. Lab. der Rijks Univ.. Janskerkhof 3, 

 UTRECHT. Holland. 



a. Genetics and developmental physiology of a polygenically determined 

 mutant type "Asymmetric". Drosophila melanogaster Meigen (Insecta) 



b. Developmental physiology and genetics of the lethal mutant character 

 (lethal-transludica). Drosophila melanogaster Meigen (Insecta) 



c. Developmental genetics of mutants. Drosophila melanogaster Meigen 

 (Insecta) (in collaboration with J. FABER. Miss A. K. KREMER, 

 I. P. KRUYT and N. SPRONK) 



SOLEWSKI. W. Dr — Zakiad Anat. Porownawczej U.J. im. H. Hoyera, 

 KRAKOW, sw. Anny 6. Poland, 

 (no embryological work in progress) 

 SPIEGEL. M. B.S. — Dept of Biol., Coll. of Arts and Sci.. Univ. of Ro- 

 chester. ROCHESTER 3. N.Y.. U.S.A. 

 a. Enzymatic digestion of the vitelline membrane and felly. Rana pipiens 



pipiens (Anura) 

 h. The action of specific antisera on cell affinity, i^ana pipiens pipiens 



(Anura) 

 c. Protein changes during LiCl treatment. Rana pipiens pipiens (Anura) 

 SPIRITO. A. Dott.. Prof. — 1st. di Biol, gen., Fac. di Med., S. Pietro, 

 PERUGIA, Italia, 

 a. Origine e natura dei tumori. Bu[o (Anura) 

 SPOFFORD. W. R. Ph.D. — Dept of Anat.. School of Med.. State Univ. 

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



a. Induction and determination in the neural plate. Amblystoma maculatum 

 (Urodela) 



b. Experimental neurogenesis. Amblystoma maculatum (Urodela) 

 SPRATT Jr. N. T. A.B.. Ph.D.. Prof. — Dept of Zool., Coll. of Sci., Lit. 



and Arts, Univ. of Minnesota, MINNEAPOLIS 14, Mich., 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) 



h. Survey of dehydrogenase enzymes in early embryos: 1. Localization of 

 enzyme activity. 2. Structural integrity and enzyme activity. Gallus do- 

 mesticus (Aves) 

 SPRONK. N. — Zool. Lab. der Rijks Univ., Janskerkhof 3, UTRECHT, 

 Holland. 



a. Influence of beryllium salts. Limnaea stagnalis (Gastropoda) 



b. Developmental genetics of the combination of two dominant mutant 

 genes Dichaete and eyeless-dominant. Drosophila melanogaster Meigen 

 (Insecta) (in collaboration with J. P. KRUYT and F. H. SOBELS) 



STARCK. D. Dr med., o. Prof. — Dr Senckenberg. Anat. Inst.. Med. Fak. 

 der Univ.. Ludwig Rehnstr. 14, FRANKFURT/Main Sud. Deutschland. 



a. Chondrocranium and osteocranium. Scotophilus temmincki and Myotis 

 myotis (Microchiroptera) 



b. Chondrocranium and osteocranium. especially orbitotemporal region of 

 skull. Struthio, Sula, Diomedea and Spheniscus (Aves) 



STARK. O. J. Dr rer. nat. — Zool. Inst, der Univ., Katharinenstr. 20, 

 FREIBURG i.Brsg.. Deutschland. 

 a. Entstehung und Determination der Geschlechtszellen und Gonaden. 

 Triton (Urodela) (gemeinsam mit O. MANGOLD) 



