CELLS IN DIVISION 



21' Johnson, H. H., Z- "'"■^- Z'^o^-> HO (1932)) 115 



218 Sturdivant, H. p., J. Morph., 55 (1934), 435 



219 Sharp, L. W., Bot. Gaz., 54 (1912), 89 



220 YuASA, A., Bot. Mag. Tokyo, 49 (1935), 868 

 221 — , Proc. imp. Acad. Japan, 12 (1936), 266 

 "*— >A J. Bot., ID (1939), 259 



223 Fry, H. J., J. exp. Zool, 43 (1925), 49 



Chromosomes and the achromatic figure 



224 Fell, H. B. and Hughes, A. F., Qiiart. J. micr. Sci., 90 (1949), 355 

 22s ScHRADER, F.,J. Morph., 69 (1941), 587 



226 Smith, S. G., Canad. J. Res., 20 (1942), 221 

 2 2' Rabl, C, Morph. Jb., 10 (1885), 214 



228 HuGHES-ScHRADER, S., Biol. Bull., Wood's Hole, 85 (1943), 265 

 228a Gelei, J., Arch. Z^lljorsch., 16 (1921), 88 



229 ScHRADER, F., J. Morph., 68 (1941), 123 



230 HuGHES-ScHRADER, S., Chromosoma, 3 (1947), i 

 2*1 SwANSON, C. p., Amer. Nat., 76 (1942), 593 



232 White, M. J. D., Proc. R. Soc. b, i 19 (1935), 61 



233 B£lar, K., Arch. EntwMech., 118 (1929), 359 



22* Bernal, J. D., Publ. Amer. Ass. Sci., 14 (1940), 199 



235 Ris, H., Biol. Bull, Wood's Hole, 85 (1943), 164 



23« Hughes, A. F. and Swann, M. M., J. exp. Biol., 25 (1947), 45 



23" CoRNMAN, I., Amer. Nat., 78 (1944), 410 



238 Ostergren, G., Bot. Notis. (1945), 767 



239 Lewis, W. H., Science, 89 (1939), 400 



2*0 Ostergren, G., Hereditas, 31 (1945), 498 



2*1 Hughes-Schrader, S., Chromosoma, 3 (1948), 257 



2*2 Schrader, F., ibid, 3 (1947), 22 



2<3 Metz, C. W., Biol. Bull., Wood's Hole, 64 (1933), 333 



2"—, Cytologia, Tokyo, 7 (1936), 219 



2^5 McClendon, J. F., Arch. EntwMech., 31 (1910), 80 



2«« Hardy, W. B., J. Physiol, 47 (1913), 108 



2*' Harris, J. E., J. exp. Biol, 16 (i939)> 258 



The spindle 



2*8 B£lar, K., Arch. EntwMech., 1 18 (1929), 374 



2*9 Darlington, C. D., Recent Advances in Cytology, London, 1937 



250 Oettle, a. C., J. R. micr. Soc, 70 (1950), 232 



251 Schmidt, W. J., Die Doppelbrechung von Karyoplasma, Metaplasma und ^vtoplasma, 



Berlin, 1937 

 252 — ^ Chromosoma, i (1939), 253 



253 Hughes, A. F. and Swann, M. M., J. exp. Biol, 25 (1948), 45 

 25* Swann, M. M., ibid, in press 

 25* — , ibid, in press 



25« Inoue, S., Personal communication (1950) 

 25'RozsA, G. and Wyckoff, R. W. G., Biochim. Biophys. Acta., 612 (1950), 334 



258 Cooper, K. W., Proc. Nat. Acad. Sci. Wash., 27 (1941), 480 



259 Lewis, M. R., Bull. Johns Hopk. Hasp., 34 (1923), 373 



260 CoNKLiN, E. G., Arm. N. T. Acad. Sci., 51 (1951), 1281 



261 Ostergren, G., Hereditas, 37 (1951), 85 

 261a Druner, L., Z- Naturw., 29 (1895), 271 



262 VVassermann, F., Wachstum und Vermehrung, Berlin, 1929 



263 Fell, H. B. and Hughes, A. F., Qiiart. J. micr. Sci., 90 (1949), 37 

 26* Schrader, F., Mitosis, New York, 1944 



26«a — J In Symposium on Cytology, Mitchigan, 1951 



