CREAM-RIPENING. 207 
For instance, if it required 32 c.c. of a tenth normal alkali 
to neutralize the acid in 50 c.c. of cream, the acidity of the 
cream would be 32°. 
(1 c.c. of N/10 alkali = 1° Mann’s Test.) 
Mann’s test reading can be converted so as to express the 
results in percentage similar to the Farrington test. As 1 c.c. 
Fal ectt) et Got PT TN ok =) 
Fie. 130.—Arrangement Fig. 131. 
for keeping alkali for 
the Mann’s test. 
of the .1 nermal alkali neutralizes .009 grams of pure lactic 
acid, 32 c.c., as in the above case, would neutralize 32 times .009. 
This would give the amount of acid, calculated in terms of 
lactic acid, present in the 50 c.c. of cream. This product 
