10 
BULLETIN 944, U. S. DEPARTMENT OF AGRICrLTI'EE. 
those from raw milk showing coagulation with alcohol slightly be- 
low this point. Samples not showing close to this schedule are not- 
included in the discussion of results. 
The samples of evaporated milk put up in baby-size cans were run 
in a Berlin pilot sterilizer used by the plant in determining the 
amount of heat the different runs would stand. 
The results of this work did not agree closely with those obtained 
at Grove City. All the samples of raw milk showing coagulation 
with alcohol gave an evaporated milk that showed curdiness after 
sterilization at a temperature of 112.8° C. (235 c F.) for 30 minutes. 
As the samples of raw milk, showing no coagulation with alcohol, 
gave evaporated milks that in the majority of cases also showed 
curdiness. no real comparison could be made as to the relative merit 
of the alcohol and acid tests. 
Table 3 shows the result of the work done at Factory A on indi- 
vidual patrons" milk samples. Of the 22 samples of raw milk show- 
ing no reaction with alcohol. 14, after evaporating, showed curdiness 
at the standard sterilizing temperature used, which happened to be 
about what was found necessary to insure a safe-keeping milk, while 
8 showed no curdiness. Of the 12 samples of raw milk showing 
coagulation with alcohol, all showed curdiness after they were evapo- 
rated and subjected to the standard sterilizing temperatures. 
Table 3. — Relation of alcohol test and tit ratable acidity in Factory A. Erapo- 
rated milk having close to 18J.5 per cent solids hot fat. Effect of sterilization- 
noted after shaking for 1 minute. 
Raw milk not coagulating J Raw milk coagulating 
with. 75 per cent alcohol, with 75 per cent alcohol. 
Acidity. 
Total 
F.:Tect of 
sterilization. 
Total 
Effect of 
sterilization. 
1 samples. 
samples. 
«*■*■ cuSV. 
Per cent. 
0.11 to 0.12... 
1 
1 

3 
3 

1 

.12 to .13... 
.13 to .14... 
.14to .15... 
.15 to .16... 
.16 to .17... 
.17To .18... 
i .19... 
4 
3 
I 

3 
. ... 
2 
2 
2 
3 
4 
1 
2 
1 3 
2 3 
4 
1 
2 I 1 

Total 
22 14 3 12 12 
The alcohol test was further tried out on a commercial basis in 
this plant. The individual cans of milk received at the intake 
were tested with alcohol according to the method already described. 
All the milk showing no coagulation with alcohol was run in a sepa- 
rate vat and condensed in the large factory pan as a separate batch. 
