30 Transactions of the Society. 



in fusion or amitosis, but we have come to the conclusion that 

 these are merely degeneration stages. 



We must not here enter upon the far-reaching question of the 

 significance of the binucleate phase. It may possibly have its 

 value in increasing the area of nuclear surface in contact with the 

 cytoplasm ; we have shown elsewhere* that there is a certain 

 amount of evidence in favour of this view. But on the other hand 

 the binucleate condition may merely indicate that the cytoplasm 

 flags in its capacity for active division before the nucleus shows 

 any sign of having passed from the energy of youth to the repose 

 of age. 



List of Memoirs Cited. 



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



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

 (1920). — Studies on the Binucleate Phase in the Plant Cell. Journ.. 



Roy. Micr. Soc, 1920, pp. 1-21 (1 pi., 2 text-figs.). 

 Beer, R. (1899).— On the Multinuclear Cells of some Grasses. Natural 



Science, xv. (1899) pp. 434-9 (2 pis.). 

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



Multinucleate 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.). 

 Brown, R. (1833). — On the Organs and Mode of Fecundation in Orchidea& 



and Asclepiadeae. Trans. Linn. Soc, xvi. (1833) pp. 685-745 (3 pis.). 

 Errera, L. (1888). — Ueber Zellformen und Seifenblasen. (Versammlung 



Deutsche Naturforscher und Aerzte in Wiesbaden.) Bot. Centralbl., 



Bd. 34 (1888) pp. 395-8. 

 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 (2 pis.). 

 Hill, T. G., & Freeman, Mrs. W. G. (1903).— The Root- Structure of 



Dioscorea prehensilis. Ann. Bot., xvii. (1903) pp. 413-24 (1 pi. and 



text-figure). 

 JoHOW, F. (1880). — Untersuchungen iiber die Zellkerne in den Secretbehah 



tern und Parenchymzellen der hoheren Monocotylen. Inaug. Diss. 



Bonn, 1880, 47 pp. 

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



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

 Nagbli, C. (1844). — Zellenkerne, Zellenbildung, und Zellenwachsthum bei 



den Pflanzen. Zeitschr. f. Wiss. Bot., von M. J. Schleiden, Bd. 1,. 



Heft I. (1844) pp. 34-133 (2 pis.). 

 Nemec, B. (1910). — Das Problem der Befruchtungsvorgjinge. Berlin : 1910^ 



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

 PiGOTT, E. M. (1915). — Notes on Nothopanax arhorcu7)i, with some Reference 



to the Development of the Gametophyte. Trans, and Proc. New- 

 Zealand Institute, xlvii. (1915) pp. 599-612 (23 text-figs.). 

 PiROTTA, R., & BuscALioNi, L. (1898). — Sulla presenza di element! vascolari 



multinucleati nelle Dioscoreacee. Annuario del R. Istituto Botanico 



di Roma, Anno VII. (1898) pp. 237-54 (4 pis.). 



* Beer, R. and Arber, A. (1919), 



