Investigations dealing with Phenomena of " Clot" Formations. 361 



11. Wager, H., 'The Action of Light on Chlorophyll," 'Roy. Soc. Proc.,' B, vol. 87, 



p. 386 (1914). 



12. "Warner, C. H., " Formaldehyde as Oxidation Product of Chlorophyll Extracts," 



' Roy. Soc. Proc.,' B, vol. 87, p. 378 (1914). 



13. Willstatter, P., and Stoll, A., ' Untersuchungen iiber Chlorophyll : Methoden 



und Ergebnisse,' BerHn, 1913. 



14. Willstatter, R., and Stoll, A., " Untersuchungen iiber die Assimilation der 



Kohlensaure," ' Berichte d. Deutsch. Chem. Gesell.,' vol. 48, p. 1540 (1915). 



15. Willstatter, R., and Stoll, A., 1 Sitzungsber. d. kgl. preuss. Akad. d. Wiss,' [p. 524, 



1915. 



Investigations dealing with the Phenomena of" Clot" Formations. 

 Part IV. — The Diphasic* Erosive Action of Salts on the 

 Cholate Gel. 



By S. B. Schryvee and Mary Hewlett. 



(Communicated by V. H. Blackman, F.R.S. Received June 26, 1916.) 



-.(From the Department of Plant Physiology and Pathology, Imperial College of Science 



and Technology, London.) 



Introduction. 



In the last communicationf of this series, attention was called to the fact 

 that the cholate gel is eroded when immersed in solutions of sodium chloride 

 and other chlorides, and that this erosive action can be " antagonised " by 

 addition to the chloride solutions of relatively small amounts of calcium 

 chloride. The analogy between this action and the biological " antagonistic " 

 action of calcium towards sodium and other salts was also commented upon 

 and illustrated by examples from the researches of Loeb, Osterhout and other 

 investigators. 



In addition, however, to the antagonism between calcium salts on the one 

 hand and sodium, potassium and magnesium salts on the other hand, Loeb 

 has shown in the case of Fiindulus that there is evidence of antagonism 

 between potassium and sodium salts, that is to say that the toxic action of 

 one salt can be rendered more or less innocuous by the addition of the other. 

 Osterhout has shown that certain marine plants will retain their vital 



* The term " diphasic " used in the sub-title to this paper refers to the diphasic form 

 of the curve produced when the concentrations of the eroding salts are plotted as 

 abscissae and the amounts of erosion as ordinates. 



t Schryver, 'Roy. Soc. Proc.,' B, vol. 89, p. 176 (1916). 



2 G 2 



