436 



Scientific Proceedings, Royal Dublin Society. 



of an organ with the conductivity of the ash of the same organ dissolved in 

 its proper volume of water appears to us to indicate that the error due to the 

 presence of colloids is not in most cases serious. Thus it seems certain that, 

 bearing these possible inaccuracies in mind, the conductivity measurements 

 give a very fair picture of tlie changes going on in the electrolyte content 

 during, for instance, tlie development of any organ, or over prolonged periods 

 of its growth. Certain generalizations may also be obtained regarding the 

 electrolyte content of various organs and. plants. 



The results obtained up to the present on saps extracted from frozen 

 organs are tabulated below aiid on the following page. Under A, P, and C 

 are given the depressions of freezing-point in degrees centigrade, the osmotic 

 pressures in atmospheres, and the specific conductivities, respectively. 



Table of Results. 



