62 



SCIENCE PROGRESS 



Also the investigations of Boodle, 1 Dandeno, 2 Lewis, 3 and others 

 show that the leaves of several ordinary plants can absorb 

 salt. In such cases of the absorption of sodium chloride, one 

 of the great dangers accruing is that of undue concentration 

 of the salt within the cells, for then various derangements, 

 e.g. the salting out of proteins, might take place. 





-&0 



-7° 



-60 



Percentage NcXl La culture solution 



Fig. 1. 



ADAPTATION TO VARYING SALINITY OF WATER 



An important characteristic feature of estuarine salt 

 marshes is the periodic inundation by the tides, and this, 

 necessarily, has a marked effect upon the soil. A region 

 which is covered only by the highest tides tends to become 

 increasingly saline during the inter-tidal cycle ; especially is 

 this the case during periods of relative drought. On the 

 other hand, all localities, uncovered by the tides, become less 

 saline after rain. 



1 Boodle, New Phyt. 3, 39, 1904. 



2 Dandeno, Trans. Canad. Inst. 7, 238, 1901. 



3 Lewis, New Phyt. 11, 255, 1912. 



