1915I J' Arthur Harris and Ross ~Aiken Gortner 67 



Any regularity of the kind noted f or the constants hitherto dis- 

 cussed cannot be detected. One can neither assert (a) that the 

 tissues of the wall show more (or less) variability in the concentra- 

 tion of electrolytes than do those of the included mass, nor (&) 

 that the series collected during a limited period of time show less 

 variability than those collected over a considerable period. 



A glance at the tables of data shows a very consistent differ- 

 ence between the electrical conductance of the sap of the ovary wall 

 and that of the abnormal mass. In no instance is the concen- 

 tration of salts in the prolification as high as the concentration 

 in the fruit wall. The absolute difference between the electrical 

 conductivity of the sap of the wall and that of the prolification 

 is remarkably constant. The differences between the averages are 

 given with their probable errors in the above summary. The 

 differences are about 20 times as large as their probable errors. 

 Thus there is no possible question of the trustworthiness of the 

 difference between the conductance of the sap expressed from the 

 ovary wall and that from the included mass. The conductance of 

 the sap from the mass is 34.7 percent, 34.6 percent, and 29.6 per- 

 cent lower than that from the wall. Note that these are higher 

 percentage differences than those obtained for the specific gravities. 

 To this point we shall return later. 



C. Depression of the freezing point and osmotic pres- 

 sure. (Data, Tables 12-16.) The osmotic pressure is due to both 

 the organic and inorganic solutes. It has been calculated from the 

 corrected depression of the freezing point by means of the f ormula 



P = 12.060 A — 0.021 A^. 



The work was facilitated by the tables which we have published 

 elsewhere (Harris and Gortner, 1914), For purposes of the present 

 discussion, the values of A and P may be taken as equivalent. Since 

 most workers are more accustomed to think in terms of atmos- 

 pheres-pressure, we shall tabulate values of P rather than A. 



