Studies on the Binucleate Phase in the Plant-cell, 21 



in which it occurred in the stele — in the conjunctive tissue, xylem, 

 parenchyma and companion cells — and also in the cortex. It 

 now seems probable, however, that the bilobing rarely, if ever, 

 goes so far as to give rise to complete division, and thus the roots 

 of Stratiotes can no longer be claimed as furnishing examples of 

 amitosis. 



List of Memoirs Cited. 



Arber, a. (1914). — On Root Development in Stratiotes aloides L. Proc, 



Camb. Phil. Soc, xvii. (1914) pp. 369-79 (2 pis.). 

 Beer, R. & Arber, A. (1915). — On the Occurrence of Binucleate and Multi- 

 nucleate Cells in Growing Tissues. Ann. Bot., xxix. (1915) pp. 597-8. 

 (1919). — On the Occurrence of Multinucleate Cells in Vegetative 



Tissues. Proc. Roy. Soc, B, xci. (1919) pp. 1-17 (1 pi. 2 text-figs.). 

 Grant, A. E. (1886).— The Multinucleated Condition of the Vegetable Cell, 



with some special Researches relating to Cell Morphology. Trans. 



Bot. Soc. Edinburgh, xvi. (1886, read June 1883) pp. 38-52 (pis. 



vand vi). 

 McLean, R. C. (1914). — Amitosis in the Parenchyma of Water-plants. Proc. 



Camb. Phil. Soc, xvii. (1914) pp. 380-2 (1 text-fig.). 

 Nemec, B. (1910). — Das Problem der Befruchtungsvorgange. Berlin (1910) 



532 pp. (119 text-figs, 5 pis.). 

 Prankerd, T. L. (1915).— Notes on the Occurrence of Multinucleate Cells. 



Ann. Bot., xxix. (1915) pp. 599-604 (8 text-figs.). 

 ScHiJRHOFF, P. N. (1916). — Kernverschmelzungen in der Sprossspitze von 



Asparagus officinalis. Flora, N.F. Bd. 9, G.R. Bd. 109 (1916) pp. 



55-60 (1 pi.). 

 Strasburger, E. (1880). — Einige Bemerkungen liber vielkernige Zellen und 



liber die Embryogenie von Lujpinus. Bot. Zeit., Jahrg. 38 (1880) 



pp. 845-54, 857-68 (1 pi.). 

 Treub, M. (1879). — Quelques recherches sur le role du noyau dans la division 



des cellules vegetales. Verhandel. d.k. Akad. van Wetenschappen, 



xix. (Amsterdam, 1879) 35 pp, (4 pis.). 



