New YorK AGRICULTURAL EXPERIMENT STATION. 221 
water. The conductivity of the latter, for all work with lactic and 
Seerie-acics.varied irom 1:2.</:10° to 1.7 10°. 
TABLE III.—SHOWING CORRECTIONS TO FORMULAS.FOR LACTIC AND 
ACETIc ACIDS. 






x CALCULATED FROM RE-| CORRECTIONS TO & CAL- 
EQurivaLent Votuwe (V) c= . 108 | SISTANCE BY FORMULA. CULATED. 
‘ Lactic. Acetic. Lactic. Acetic. 
145), Ss Ba8 Gee Dae ee 8.000 8.000 8.000 +0.000 +0.000 
Lee) cc eee, ho asics Flos oe. bese foe 4.000 4.140 4.025 —0.140 —0.025 
Ores. oie ENS AaOICR ie a keke eae 2.000 PAA ORR 2.038 —0.102 —0.038 
NOOO) 5 2 af ogee RR oe near 1.000 1.042 1.016 —0.042 —0.016 
PAU 2 4.5 3G” ee ace eee 0.500 0.500 0.500 +0.000 +0.000 



The series of resistances, from which the formula constants and 
intermediate corrections were calculated in the case of these two 
acids, were taken in the usual manner by dilution in the cell, check- 
ing the results by duplicates of the higher dilutions made directly 
from the lowest, and by running duplicate series. 
The values found for the molecular conductivity of lactic acid, 
after making correction for the conductivity of the water, are 
considerably higher than those given by Ostwald.t. We are unable 
to account for this difference, since we observed all required pre- 
cautions, using Kahlbaum’s c. p. acid and preparing fresh N-10 
solutions with which to run duplicate series. 
In taking the resistance of lactic acid, it was found necessary 
to heat the electrodes, as recommended by Whetham,? changing 
the platinum black to gray, before we could obtain accurate 
readings. | 
re 
EXPERIMENTAL RESULTS. 
While the main purpose of our work was to study the action 
of dilute acids upon casein when no soluble compounds are formed, 
it became necessary to ascertain the conditions under which soluble 
compounds are formed, in order to avoid such solution. We shall, 
therefore, consider this phase of our work first. 
1Kohlrausch. Leit. d. Elek., p. 179. 
Phil. Trans. Roy. Soc. London, 1943343. 1900. 
