378 IMMUNOLOGICAL STUDIES 



Schechtman, A. M. 1952. Physical and chemical changes in the circu- 

 lating blood. Ann. N. Y. Acad. Sci., 55, 85-98. 

 Schechtman, A. M. 1955. Ontogeny of the blood and related antigens 



and their significance for the theory of differentiation. In Biological 



Specificity and Growth, E. G. Butler, editor. Princeton University 



Press, Princeton, N. J. Pages 3-31. 

 Schechtman, A. M., and H. Hoffman. 1952. Serological studies of the 



origin of globuHns in the serum of the chick embryo. /. Exptl. Zool., 



120, 375-90. 

 Schechtman, A. M., and G. W. Nace. 1950. Development of serum 



proteins in the embryonic chick. Anat. Record, 106, 436. 

 Sigurdsson, B. 1942. A new method for demonstrating cyto-antibodies 



in vitro. Proc. Soc. Exptl. Biol. Med., 50, 62-66. 

 Snell, G. D. 1952. The immunogenetics of tumor transplantaton. Can- 

 cer Research, 12, 543-46. 

 Sonneborn, T. M. 1948. The determination of hereditary antigenic dif- 

 ferences in genically identical Paramecium cells. Proc. Natl. Acad. 



Sci., 34, 413-18. 

 Sonneborn, T. M. 1950. The cytoplasm in heredity. Heredity, 4, 11-36. 

 Spar, I. 1953. Antigenic differences among early developmental stages 



of Rana pipiens. }. Exptl. Zool, 123, 467-97. 

 Spencer, R. R. 1942. Tumor immunity. /. Natl. Cancer Inst., 2, 317-32. 

 Spiegel, Melvin. 1954a. The role of specific surface antigens in cell 



adhesion. Part I. The reaggregation of sponge cells. Biol. Bull, 107, 



130-48. 

 Spiegel, Melvin. 1954b. The role of specific surface antigens in cell 



adhesion. Part II. Studies on embryonic amphibian cells. Biol. Bull, 



107, 149-55. 

 Spiegel, Melvin. 1955. The reaggregation of dissociated sponge cells. 



Ann. N. Y. Acad. Sci., 60, 1056-76. 

 Steinmiiller, O. 1937. Phagozytoseversuche am lebenden Hiihnerem- 



bryo. Arch. Entwicklungsmech. Organ., 137, 13-24. 

 Stratton, F. 1943. Demonstration of the Rh-factor in the blood of a 



48 mm. embryo. Nature, 152, 449. 

 Telfer, W. H. 1954. Immunological studies of insect metamorphosis. 



II. The role of a sex-limited blood protein in egg formation by the 



Cecropia silkworm. /. Gen. Physiol, 37, 539-58. 

 Telfer, W. H., and C. M. WiUiams. 1953. Immunological studies of 



insect metamorphosis. I. QuaHtative and quantitative description of 



