CREA M-RIPENINO. 



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 alkah = l° 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. 



Fig. 130. — Arrangement 

 for keeping alkali for 

 the Mann's test. 



Fig. 131. 



of the .1 normal alkaU neutraUzes .009 grams of pure lactic 

 acid, 32 c.c, as in the above case, would neutraUze 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 



