342 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1952 



Sheldon, William H. 



1940. The varieties of human physique. New York. 

 Spemann, Hans. 



1938. Embryonic development and induction. Yale Univ. Press. 

 Spemann, H., and Mangold, H. 



1924. "Cher Induction von Embryonalanlagen durch Implantation art- 

 fremder Organisatoren. Arch. Mikr. Anat., vol. 100, pp. 599-638. 

 Spiegelman, S. 



1948. Differentiation as the controlled production of unique enzymatic 

 patterns. Symp. Soc. Exp. Biol., vol. 2, p. 286. 

 Stowell, R. E. 



1945. Feulgen reaction for thymonucleic acid. Stain Techn., vol. 20, p. 45. 

 Streeter, George. 



1926. The "Miller" ovum. The youngest normal human embyro thus far 

 known. Contr. Embryol., vol. 18, No. 92. Carnegie Inst. Wash- 

 ington Publ. 363. 

 Waddington, C. H. 



1948. The genetic control of development. Symp. Soc. Exp. Biol., vol. 2, 

 p. 145. 

 Weidenrich, F. 



1946. Apes. In Apes, giants and man. Univ. Chicago Press. 



Reprints of the various articles in this Report may be obtained, as long as 

 the supply lasts, on request address to the Division of Publications, Smith- 

 sonian Institution, Washington 25, D. C. 



