72 Physico-Chemical Properties of Vegetdble Saps [March, 



TABLES 17-21 



Data pertaining to concentration and mean molecular weights of solutes in 



the saps 

 Table 17, Scries A 



small are several times as large as their probable errors. Thus, the 

 difference between the ratio f or exp. C and D is 0.000364 + 0.000036, 

 that between C and E is 0.000245 + 0.000040, that between D and 

 E is 0.000119 + 0.000048. The mean difference between the con- 

 stants f or the ovary wall and the included mass is in all cases over 

 ten times as large as its probable error, and so unquestionably 

 significant. 



E. Mean molecular weicht of the solutes in the sap. 

 (Data, Tables 17-21.) The results for mean molecular weight of 

 the solutes is much less consistent from sample to sample than any 

 other measure here discussed. This is to be expected from the 

 technical difficulties in its determination. As we have computed 



