Duggar — Relation of Marine Algae to Salt Solutions. 489 



the first instance by Loew.* These facts have subsequently 

 been much extended by the work of Loew,t Loeb, Loew and 

 May, Kearney and Cameron, and many others. | 



While the toxic studies afford facts of interest in them- 

 selves, they do not throw any great amount of light upon the 

 preliminary osmotic experiments which have been outlined. 

 it is probable that a number of other factors, especially that 

 of penetration of solutes, must be more carefully studied be- 

 fore the divergent osmotic results can be systematically 

 explained. Preliminary experiments indicate that the marine 

 algae are very sensitive to acids and acid salts, but the results 

 thus far obtained in this direction will be reserved for subse- 

 quent report. 

 (Botanical Departmeut, Universitj of Missouri.) 



Issued December 21,1906. 



* Loew, O. Ueber die physiologischen Functionen der Calcium und 

 Magnesiumsalze in Pflauzenorganismus. Flora. 1892, 



t 1. c. 



X There has appeared since the above was written the interesting paper 

 by Osterhout (On the Importance of Physiologically balanced Solutions for 

 Plants. Bot. Gaz. 42 : 127-134), which is of special importance in this con- 

 nection. 



