62 



Physico-Chemical Properties of Vegetdble Saps [March, 



The results are in substantial agreement with the findings for spe- 

 cific gravity. 



We have been considerably surprised at the narrow limits of 

 Variation in specific gravity. The observed ranges are : 



Experiment 



A 

 B 

 C 

 D 

 E 



Wall 

 I.O186 — I.O215 =r 0.0029 



I.Ol 94 — 1.0234 = 0.0040 



I.OI9O — I.022I = 0.0031 

 I.OI83 — I.020I = 0.0018 

 I.O183 — 1.0239 = 0.0056 



Prolification 



1.0168 — I.OI95 = 0.0027 



I.Ol 79 — 1.0229 = 0.0050 



1.0169 — 1.0204 = 0.0035 

 I.OI71 — I.OI91 = 0.0020 



1.0170 — 1.0228 = 0.0058 



If one expresses the Variation, in specific gravity, in the more sci- 

 entific terms of the Standard deviation,® the results are, for the 

 three large series: 



The entries in this summary show, as do the ranges given above, 

 that the Variation in specific gravity within a particular series is 

 very low indeed. 



For both wall and prolification ,the variability in specific gravity, 

 as measured in terms of the Standard deviation, is higher in exp. E 

 than in either of the others. Thus, numerically the differences 

 between exp. C and E are : 



For wall, 0.000587 + 0.000195, d/Ei = 2.99 ; 



For prolification, 0.000674 + 0.000207, d/Eä = 3.26 ; 

 while that between the same constants, for D and E, are : 



8 For the method of calculating the Standard deviation, and the probable 

 errors of means of series of observations as given in this paper, the reader must 

 consult texts on higher statistics. 



