New York AGRICULTURAL EXPERIMENT STATION. 257 
TABLE XIX.— SHOWING AMouUNTS OF Lactic AcID TAKEN UP BY CASEIN AT 
0° C.— (Continued). 







ges] 2 | EBs | FEBE | BEF | SE |S 
@ g oO 8 nl oo Liar Our) Ane p> 
g ae o a§ | eve 98 eres 
rs v4, 2 RS igs CaS 5 as o-8 
Sensi 8 e872 Weg Sneha wes wa 8 
= Lana ¢ [a0] upon owt lo} Hert stan Me) om go O @ 
goge ou <q ie el a ates eye) ems! a se! 
gna cs 90 903 e38a8,| Syang | of F 36 
Oona H gaa galas | BsaSd S325 bo 
Au eS Oo oO Ay ~% Q 
0 O22 0 0 CR ey v'ledter teh des, as 
N-500 5 min 1.855 6.7 3.5 3.6 0 
45 min 1.611 ole 16.8 19.3 O 
100 6=¢ 14 hrs. 1.547 ie iad 19.5 24.2 O 
coe 2 6 hrs. 1.294 62.8 ee 48.5 | ut 
Set 0 1.908 0 0 Ne, & Lee 
Rete L2er hrs: 1.095 Sita 42.6 14.2, 1 
: 24 hrs. 1.069 83.9 44.0 78.5 2 
48 hrs 1.062 84.6 44.3 79.7 2 
N-125 0 8.048 0 0 OS ee arte: 
100 c. c. 5 min, 7.073 97.5 Leal 13.8 1 
for 45 min, 6.723 ooeo 16.5 19.7 1 
1 gram 14 min. 6.040 200.8 25.0 gove 2 
of 6 hrs. 5.140 290.8 36.1 56.6 3 
casein. 10. hrs. 4.841 PAU ys 40.0 66.2 4 
24. hrs 4.652 339.6 42.2 73.0 4 
SOm irs 4.580 346.8 43.0 Tia t 3 





The results embodied in the preceding table may be summarized 
as follows: 
(1) The amount of lactic acid taken up by casein varies with 
the time of contact and the concentration of the acid in which the 
action takes place. 
(2) The amount of lactic acid taken up at equilibrium by 1 gram 
of casein varies nearly in proportion to the final concentration of the 
free acid surrounding the casein, as we have found to be true in 
case of hydrochloric acid. The amount of lactic acid taken up 
under similar conditions by 1 gram of casein is less than in the case 
of hydrochloric acid. 
(3) In the case of lactic acid, the ratio obtained by dividing the 
amount of acid in I gram of casein by the amount of acid in I cc. 
of the surrounding solution is 75.7 to 83, within the concentrations 
tested, when equilibruim is approached, which occurs at 0° C, in 
24 hours, while in the case of hydrochloric acid the ratio is 
about 147. 
17 
