94 MARY ELMORE SAUER AND DONALD DUNCAN 



nuclei in the neural tube of the chick embryo: evidence for intermitotic migration 



of nuclei. Exptl. Cell Research 16, 1-6. 

 Sauer, M. E., and Walker, B. E. 1959. Radioautographic study of interkinetic nuclear 



migration in the neural tube. Proc. Soc. Exptl. Biol. Med. 101, 557-560. 

 Sauer, M. E., and Walker, B. E. 1961. Radiation injury resulting from nuclear 



labeling with tritiated thymidine in the chick embryo. Radiation Research 14, 



633-642. 

 Schneller, M. B. 1951. The mode of action of hard .x-rays on the 33- and 60- hour 



chick embryo. /. Morphol. 89, 367-395. 

 Sidman, R., Miale L L., and Feder, N. 1959. Cell proliferation and migration in the 



primitive ependymal zone: an autoradiographic study of histogenesis in the ner\ous 



system. Exptl. Neurol. 1, 322-333. 

 Sparrow, A. H., and Hammond, M. R. 1947. Cytological evidence for the transfer of 



desoxyribose nucleic acid from nucleus to cytoplasm in certain plant cells. Am. ]. 



Botany 34, 439-445. 

 Spear, F. G., and Gliicksmann, .\. 1938. The effect of gamma radiation on cells 



in vivo. Brit. ]. Radiol. 11, 533-553. 

 Stroud, A. N., and Brues, A. M. 1954. Radiation eflfccts in tissue culture. Texas 



Repts. Biol, and Med. 12, 931-944. 

 Swift, H. 1953. Quantitative aspects of nucleoproteins. Intern Rev. Cytol. 2, 1-76. 

 Theorell, B. 1955. Nucleic acids in chromosomes and mitotic division. In "The Nucleic 



Acids" (E. Chargaff and J. N. Davidson, eds.), Vol. 2, pp. 181-198. Academic 



Press, New York. 

 Vendrely, R., Alfert, M., Matsudaira, H., and Knobloch, A. 1958. The composition of 



nucleohistone from pycnotic nuclei. Exptl. Cell Research 14, 295-300. 

 von Sallmann, L., Caravaggio, L., Munoz, C. M., and Drungis, A. 1957. Species differ- 

 ences in the radiosensitivity of the lens. Am. ]. Ophthalmol. \3] 43, 693-704. 

 von Sallmann, L., Tobias, C. A., Anger, H. O., Welch, C, Kimura, S. F., Munoz, 



C. M., and Drungis, A. 1955. Effects of high-energy particles, x-rays, and aging of 



lens epithelium. A.M. A. Arch. Ophthalmol. 54, 489-514. 

 Wanko, T., von Sallmann, L., and Gavin, M. A., 1959. Early changes in the lens 



epithelium after roentgen irradiation. A correlated light and electron microscope 



study. A. M. A. Arch. Ophthalmol. 62, 977-984. 

 Watterson, R. L., Veneziano, P., and Bartha, A. 1956. Absence of a true germinal 



zone in neural tubes of young chick embryos as demonstrated by colchicine tech- 

 nique (Abstract). Anat. Record 124, 379. 

 Wigglesworth, V. B. 1942. The significance of "chromatic droplets" in the growth of 



insects. Quart. J. Microscop. Sci. 83, 141-152. 

 Wilson, E. B. 1934. "The Cell in Development and Heredity," 3rd ed., pp. 323-328. 



Macmillan, New York. 



