Herrm 42 Hillem 



c. Chemical fractionation of cell nuclei and mitochondria of differentiating 

 muscle. Callus (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 somites in explants (Spratt technique). Gallus 

 (Aves) (in collaboration with 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 Lying-in Hospital, 221 Longwood Ave, BOSTON 15, Mass., 

 U.S.A. 



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

 U.S.A. 



a. Development of ova from fertihzation to 14 days (first missed menstrual 

 period). Homo (Primates) (in collaboration with J. ROCK) 



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

 a 30-cell early blastula (4 days-uterine), and a 60-cell blastula (43/2 — ^ 

 days-uterine). Homo (Primates) (in collaboration with W. J. MULLI- 

 GAN and 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. (no data received over this year) 



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

 Georgia, AUGUSTA, Ga, U.S.A. 

 (no data received over this year) 



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

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

 a. Permeability of the placenta. Mus rattus and Cavia (Rodentia) (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", 

 Dolhs Ave, Finchley, LONDON N. 3, England (U.K.) 

 a. Studies in development, especially placentation. (Mammalia) 



HILLEMANN, H. H. B.S. M.A.. Ph.D. — Dept of Zool., Oregon State 

 Coll., CORVALLIS. Ore., U.S.A. 



a. The pattern of circulation in the placenta. Cricetus auratus (Rodentia) 



b. Ossification and calcification from postnatal day 8 to the adult condition. 

 Cricetus auratus (Rodentia) 



c. The morphological relations and development of the bony ear. Cavia 

 porcellata (Rodentia) 



