THE PEOBLEI\[ OF MITOSIS. 
591 
to establish further generalisations upon which investigators 
ai’e agreed. Unfortunately the technical difficulties of this 
research and the small likelihood of obtaining results leading 
directly to an explanation have deterred students from under- 
taking investigations : the work done has consequently been 
confined to the laboratories of a few eminent cytologists. 
Only by patiently collecting data and building one established 
proposition upon another shall we arrive at the solution of 
this problem, which we have found to be so complex. 
Bibliogkaphy. 
Baltzei", F. (1908). — “ Uber mehrpolige Mitosen bei Seeigeleiern,” ‘Verb, 
med-phys. Ges. Wurzburg, ’ Bd. xxxix. 
(1911). — “ Zur Kenntnis der Mecbauik der Kernteilungsfigureu,” 
‘ Arch. f. Entwick-mech.,” Bd. xxxii. 
Gallardo, A. (1896). — “ Essai d'interpretation des figures karyocinc- 
tiques,” ‘Ann. Mus. Nac. Buenos Aires,’ t. v. 
(1900). — “A propos des figixres karyocinetiques,” ‘ C. R. Soc. 
Biol.,’ t. lii. 
(1901). — “ Les croisements des radiations polaires et I’interpre- 
tation dynamiq\ie des figures de karyocinese,” ‘ C. R. Soc. Biol.,’ 
t. liii. 
(1906). — “L’interpretationbipolairede la division karyocinetique,” 
‘Ann. Mus. Nac. Buenos Aires,’ t. xiii. 
(1909). — “La division de la cellule, phenoniene bipolahe de 
caractere electro-colloidal,” ‘ Arch. f. Entwick-mech.,’ Bd. xxviii. 
(1912). — “ Les theories de la division cellnlaire,” ‘ Bull. d. 1. Bib. 
Amer.,’ No. 7. 
Hartog, M. (1905). — “ The Dual Force of the Dividing Cell,” ‘ Proc. Roy. 
Soc.,’ B. vol. Ixxvi. 
(1907). — “ The Dual Force in the Dividing Cell,” ‘Science Pro- 
gress,’ No. 6. 
(1909). — “ Mitokinetism in the Mitotic Spindle and the Poly- 
asters,” ‘ Arch. f. Entwick-mech.,’ Bd. xxvii. 
(1910). — “ The new force : Mitokinetism,” ‘ Rep. Brit. Assoc., Sect. 
D., Sheffield.’ 
Lawson. A. A. (1911). — “Nuclear Osmosis as a Factor in Mitosis.” 
‘ Trans. Roy. Soc. Edin.,’ vol. xlviii. Part 1, No. 7. 
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