108 ^^E BOTANICAL MAGAZINE. [v«i xxxiii. No. m 



way distorted and the vegetative cells are made tneristic or "equi- 

 potcntial" in such a wa}' that grov^'th begins toward the direction 

 perpendicular to the normal axis of growth. The phenomena may be 

 described as "dominance" of "primary axis" is discharged (Child : 

 1915). 



MiEHE (1905) observed in the plasmolyzed cell of Cladophora that 

 the single isolated cell showed polarit}' of the entire plant i.e., forming, 

 the new apical growth at the apex and the rhizoid at the base. The 

 action of plasmolysis is in essential an isolation. Isolation is meant 

 here in a physiological sense not necessarily meant that the protoplas- 

 mic connection broken by plasmol3'sis. The adventitious growth of 

 the gemmae of Marchantia by means of plasmolysis may be regarded 

 as a case of regeneration.** 



The accumulation of starch in the chloroplasts of the plasmolyzed 

 cell is already referred to. It may be the result of temporary arrest 

 of diastase activities, thereby the distribution of nutrient substances, 

 especiall}' assimilates of soluble forms would become irregular. Since 

 the regeneration-stimuli are bound up with nutrition (Nemec : 1905, p. 

 308.), this abnormal condition may disturb the established equili1)rium 

 in the gemmae, hence polarity (cf Klebs : 1904, p. 608 et seq.). 



November, 1918. 



Literature Cited. 



Api'I.eman, C. O. (1918): Specific Growth-Promoting Substances and 



Correlation. Science. N. S. 48 ; 1918. 319. 

 Child, C. M. (1915): Individuality in Organisms, pp. 213. 1915. 



Chicago. 

 Gaidukov, N. (1910): Dunkelfcldbelcuchtung u. Ultramikroscopie in 



der Biologic u. in d. Mcdizin. pp. 84. 1910, Jena. 

 GoEBEL, K. (1902) : Ucber Regeneration im Pflanzenreich. Biologisch. 



Centralbl. 22: 1902, 385. 

 IliXHT, K. ri912) : Studien iiber den Vorgang der Plasmolyse. Bci- 



Lriigc z. d. Biologic d. Pflanzen. 11 : 1912, 137. 

 Klebs. G. (1904) : Ubcr Probleme der Entwickelung. Biol. Centralbl. 



24 : 1904, 527. 



12 The term regeneration used here is in a broad sense. vSee di-scussion by 

 GoEBEL (I'JOS) and Nemec (1905) chapter III. 



