Herrmann 42 Hill 



b. Determination and fractionation of nucleoproteins and determination of 

 enzymes in chick somites from the 2nd to the 5th day of incubation and 

 in differentiating chick muscle from the 7th day of incubation to hatching. 

 (Aves) (in collaboration with B. J. NEUKOM and M. J. SCHNEIDER) 



c. Chemical fractionation of cell nuclei and mitochondria of differentiating 

 muscle of chick. (Aves) (in collaboration with B. J. NEUKOM and 

 M. J. SCHNEIDER) 



d. Histological examination of muscle development including quantitative 

 determinations of volume of somite columns, of cell number, and of 

 mitotic index of somites. (Aves) (in collaboration with B. J. NEUKOM 

 and M. J. SCHNEIDER) 



e. Study of differentiation of chick somites in explants (Spratt technique). 

 (Aves) (in collaboration with L. LUBCHENCO, J. McKENZIE and 

 U. ROTHFELS) 



f. Study of developmental disturbances related to nutritional deficiencies 

 investigated by application of anti-vitamins and anti-amino acids to the 

 intact egg and to explants (somites). In particular, it will be attempted 

 to define the factors which maintain the balance between myotome, 

 sclerotome and dermatome during differentiation of the somite and are 

 required for the normal development of the retina (possible connection 

 with retrolental fibroplasia of the premature human infant) (Aves) 

 (in collaboration with L. LUBCHENCO, J. McKENZIE and U. 

 ROTHFELS) 



HERTIG, A. T. M.D., Prof. — Harvard Univ., Med. School., Dept of 

 Pathol., 25, Shattuck Str., BOSTON 15, Mass., U.S.A. 



— Boston Lyinq - in Hospital, 221, Longwood Ave, BOSTON 15, Mass., 



U.S.A. 



— Free Hospital for Women, 245, Pond Ave., BROOKLINE, Mass.. 



a. Development of Human ova from fertilization to 14 days (first missed 

 menstrual period). (Mammalia) (in collaboration with J. ROCK) 



b. A morphologic description of 3 segmenting human embryos; a 2-cell tubal 

 ovum, a 30-cell early blastula (4 days-uterine), and a 60-cell blastula 

 (4 ]/2 — 5 days-uterine). (Mammalia) (in collaboration with J. ROCK) 



HETTIG, R. A. M.D., Prof. — Dept of Anat., Coll. of Med., Baylor Univ., 

 1200 M.D. Anderson Blvd. Texas Med. Center, HOUSTON 5, Tex., 

 U.S.A. 

 a. The production of anomalies in tat embryos by nitrogen mustards. Mus 

 norvegicus (Mammalia) 

 HEUSER, C. H. Prof. (Emer.) — Dept of Anat., Univ. of Georgia, Med. 

 School, AUGUSTA, Ga, U.S.A. 

 a. Morphology of early human and other primate embryos. Homo, Pan, 

 Papio and Macaca rhesus 

 HEYN, C. B. Cand.Med. — Anat.-Embryol. Lab. of the Univ. of Leyden, 

 Fac. of Med., Boerhaavekwartier, Wassenaarseweg, LEIDEN, Holland, 

 a. Permeability of the placenta in rat and Guinea pig. (Mammalia) (in col- 

 laboration with J. DANKMEIJER) 

 HILL, J. P. F.R.S., Prof. (Emer.) — Dept of Embryol., Univ. Coll. London, 

 Gower Str., LONDON W.C. 1, England. Private addr.: "Kanimbla". 

 Dollis Ave, Finchley, LONDON N. 3, England, 

 a. Studies in mammalian development, especially placentation. (Various 

 Mammalia) 



