HISHIDA, T. M.A. — Biol. Inst., Fac. of Sci., Nagoya Univ., Chikusa-ku, 

 NAGOYA, Japan 



a. Metabolic analysis of early development. Oryzias latipes (Teleostei) (in 

 collaboration with E. NAKANO) 



b. Melanin formation in color phenotypes. Oryzias latipes (Teleostei) (in 

 collaboration with T. YAMAMOTO and H. TOMITA) 



c. Physiological study of sex differentiation. Oryzias latipes (Teleostei) 

 HJELMMAN, G. Prof. — Anat. Inst., Univ. of Helsinki, HELSINKI, Fin- 

 land 



(no embryological work in progress) 

 HOADLEY, L. F.I.I.E., Prof. — Biol. Lab., Harvard Univ., Divinity Ave., 



CAMBRIDGE 38, Mass., U.S.A. 

 HOEFSMIT, Miss E. C. M. Med.Drs. — Anat.-Embryol. Lab., Fac. of 



Med., State Univ., Wassenaarseweg, Boerhaavekwartier, LEIDEN, 



Netherlands 

 a. Development of ductus arteriosus. Mus norvegicus albinus (Rodentia) 

 HOFMAN, L. — Inst, de Biol., Fac. de Med., Salata, ZAGREB, Yougoslavie 

 a. Relative growth of organs in the embryo. Rattus norvegicus albinus 



(Rodentia) (in collaboration with N. SKREB) 

 HOGUE, Miss M. J. A.B., Ph.D., Prof. (Emer.) — Dept. of Anat., School 



of Med., Univ. of Pennsylvania, PHILADELPHIA 4, Pa., U.S.A. 

 HOLLANDER, W. F. B.A., M.S., Ph.D. — Dept. of Genetics, Iowa State 



Univ., AMES, Iowa, U.S.A. 



a. Genetic mutants — polydactylism, lethal types. Mus musculus (Roden- 

 tia) 



b. X-ray induced dominant lethal effects. Mus musculus (Rodentia) 



c. X-ray induced chromosome-translocation effects. Mus musculus (Ro- 

 dentia) 



d. Genetic mutants. Columbia livia (Aves) 



HOLM, K. A. Fil.Dr. — Zool. Inst., Uppsala Univ., UPPSALA, Sweden 

 a. Experimental investigation of the embryo (determination, prospective 



significance of embryonic areas). (Araneae, Arachnoidea) 

 HOLST CHRISTENSEN, P. J. Dr.Phil. — Inst, for Aim. Zool., Universi- 



tetsparken 3, COPENHAGEN 0, Denmark 

 HOLTER, H. Ph.D., M.I.I.E. — Physiol. Dept., Carlsberg Lab., 10 Gl. 



Carlsbergvej, COPENHAGEN, Valby, Denmark 

 HOLTFRETER, J. K. F. Ph.D., F.I.I.E., Prof. — Dept. of Biol., Coll. of 



Arts and Sci., Univ. of Rochester, ROCHESTER 20, N.Y., U.S.A. 



a. Accessory tails , .induced" by chemically inert substances. Xenopus laevis 

 (Anura) 



b. Studies on competence changes in aging ectoderm. Pleurodeles Waltlii 

 (Urodela) 



c. Production of a third median eye by UV irradiation. Ambystoma punc- 

 tatum (Urodela) 



d. Studies on muscle development. (Amphibia) 



HOLTZER, H. Ph.D., M.I.I.E. — Dept. of Anat., School of Med., Univ. of 

 Pennsylvania, PHILADELPHIA 4, Pa., U.S.A. 



a. Myogenesis. (Vertebrata) 



b. Chondrogenesis. (Vertebrata) 



63 



