On the Accommodation of Some Infusoria to 

 the Solutions of Certain Substances 

 in Various Concentrations.* 



( Preliminary Note.) 

 By Atsushi Yasuda. 



Botanical Institute, Science College, Imp. Univ., Tokyo. 



Organisms are generally influenced by external circumstances, and 

 when the medium, in which they are found, is changed they, to a certain 

 extent, accommodate themselves to the new one. About this faculty a 

 number of investigators have already contributed ' to our knowledge 

 many interesting facts, various media and organisms having been 

 submitted to observation. 



Among lower plants, Stahl 1 ' studied the accommodation of some 

 myxomycètes to gt'ape-sugar solutions. Klebs 2) noted the recovery of 

 fresh-water algae from the plasmolysis caused by solutions of some 

 chemical substances, and in this way established to some extent their 

 power of adaptation to the new media. Richteb 3) made some detailed 

 experiments on the accommodation of fresh-water algae to common-salt 

 solutions. The same result as that found by Klebs was observed by 

 Janse 4) with fresh-water and marine algae, and also by Oltmanns 5 ' in 



* Beprinted, with the author's approval, from the Botanical Magazine, Tokyo, Vol. XI, 

 No. 121, published March 20, 1897. 



1) E. Stahl. Zur Biologie der Myxouiyceten. Bot, Ztg., 1884. Nr. 10, p. 166. 



2) Gr. Klebs. Beiträge zur Physiologie der Pflanzenzelle. Berichte der deutsch, 

 bot. Gesellsch., 1887. Bd. V, Heft 5, p. 181. 



3) A. Richter. Ueber die Anpassung der Süsswasseralgen on Kochsalzlösungen. 

 Flora, 1892, p. 4. 



4) J. M. Janse. Plasmolytische Versuche an Algen. Bot. Centralbl., 1887. Bd. 

 XXXII, p. 21. 



5) F. Oltmanns. Ueber die Bedeutuug der Concentrationsänderung des Meerwas- 

 sers für das Leben der Algen. Sitzb. d. Königl. preuss. Akad. d. Wissensch, zu Berlin, 

 1891, p. 193. 



