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19 Martens, P., Cellule, 38 (1927), 67 



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-1 Brown, R., Traris. Linn. Soc, 16 (1833), 685 



-2 ScHAEDEj R., Beitr. Biol. Pflanz., 14 (1925), 231 



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— , — , Arch. Biol., 62 (1951), i 

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28 Shigenaga, M., Cytologia, Tokyo, Fujii Jub. vol. I (1939), 464 



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»a Gregory, W. C, Amer. J. Bot., 27 (1940), 687 



33 Stern, H., J. Hered., 37 (1946), 46 



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" Taylor, J. H., J. Hered., 40 (1949), 87 



3* Darlington, C. D., and La Cour, L. F., The Handling of Chromosomes, London, 



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*i Chalkley, H. W. and Daniel, G. E., Physiol, ^ool., 6 (1933), 592 

 *2 Dawson, J. A., Kessler, W. R. and Silberstein, J. K., Biol. Bull. Wood's Hole, 



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 " — , — , — , ibid, 69 (1935), 447 



** CoMANDON, J. and de Fonbrune, P., C. R. Soc. bioL, 124 (1937), 1299 

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 *9 — , DE Fonbrune, P. and Jolly, J., ibid, wj (1934), 9.75 

 *° Hughes, A. F. and Preston, M. M.'E., J. R. micr. Soc, 69 (1949), 121 

 " Dearing, W. H., J. Morph., 56 (1934), 157 

 ^* Jacobson, W. and Webb, M., J. Physiol., 1 12 (1951), 2P 

 ^' Alfert, M., J. cell comp. Physiol., 36 (1950), 381 

 ^* Caspersson, T., Cell Growth and Cell Function, New Yorkj 1950 

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 ** Engstrom, a., in Progress in Biophysics, ed. J. A. V. Butler and J. T. Randall, 



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Time scale of the mitotic cycle 



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*i* — ibid 20 (1924), 21 1 



*2 Wright, G. P., J. R. micr. Soc, — (1925), 414 



*' Gray, L. H., and Scholes, M. E., Brit. J. Radiol., 34 (1951) 



"a Brown, K., J. exp. Bot., 2 (1951), 96 



•* Laughlin, H. H., Carn. Int. Wash. Publ. 265 (1919), 488 



^^ Cooper, Z. K. and Schiff, A., Proc Soc. exp. Biol., N.T., 39 (1938), 323 



*' — and Franklin, H. C, Anat. Rec, 78 (1940), i 



