I9I5] 



/. Arthur Harris and Ross Aiken Gortner 



71 



Iower than those for electrolytes, which were 34.7, 34.6 and 29.6 

 percent. 



These facts seem to indicate that the differentiation between 

 fruit wall and included mass due to electrolytes tends to be strongly 

 reduced by the non-electrolytes. We noted that the difference for 

 specific gravity was only from 5.50-1 1.50 percent, as compared 

 with 30,00-35.00 percent for electrolytes. This may be taken as 

 evidence in the same direction as the findings for osmotic pressure. 



D. Ratio of electrical conductivity to Depression of the 

 FREEZING POINT. (Data, Tablcs 7-1 1.) We have desired to de- 

 termine the amounts of mineral salts and organic constituents of 

 the sap, but because of the great technical difficulties have been 

 unable to do so for a series of materials as extensive as those with 

 which we have had to deal. We have therefore contented ourselves 

 with the determination of the ratio of the conductivity to the de- 

 pression of the freezing point. While these are not measures in 

 the same terms, a comparison of the ratios in such closely related 

 materials as the tissues of the ovary wall and of the abnormal mass 

 is perhaps quite legitimate. 



This ratio is given in our tables as k/A. On the assumption 

 that nearly all of the electrical conductivity is due to dissociated 

 inorganic salts, such a ratio shows the relative proportion of salts 

 in the total solutes. The results are remarkably consistent. In 

 only one sample does the difference between the ratios possess a 

 positive sign. Thus the organic substances form a greater and the 

 inorganic a smaller proportion of the solutes in the sap of the pro- 

 lification than do those in the sap of the ovary wall. The averages 

 for the three larger series are given below : 



The constants for comparable tissues are in good general agree- 

 ment from series to series, but the differences though actually very 



