9S SOME RECENT RESEARCHES IN PLANT PHYSIOLOGY 



ment become of serious importance. This is not felt to 

 anything like the same extent in the conductivity measure- 

 ments, and they are seen to be very uniform in the table 

 below. 



TABLE XXVIII. 



OSMOTIC PBESSURES AND ELECTRICAL CONDUCTIVITIES OF 



SOME SECRETIONS. * 



The measurements carried out upon Colocasia secretion 

 show that normally the cell solutes do not pass outwards 

 even when there is a rapid stream of water. 



THE PENETRATION OF SALTS INTO LEAVES. 

 Concerning the entrance of salts some interesting facts 

 have been brought to light by Lewis (1912). This worker 

 studied the effect of immersing the leaves of various non- 



