126 



The clear lime water may be removed with a pipette when 

 wanted, or it may all be transferred to another bottle by means 

 of a syphon. The receiving bottle should be washed with the 

 lime water. The original bottle may be refilled and drawn 

 upon as needed. It is absolutely essential that lime water 

 so prepared be kept free from air. 



Another and probably better method of handling is to at- 

 tach a syphon to the original bottle containing the lime water 

 connected to a burette with two way stop cock. This makes 

 an almost automatic refilling apparatus. A small hole must 

 be placed in the cork, in which a tube containing lime may 

 be placed, protected by cotton or cork from too free ingress 

 of air. This, however, is not essential with solution contain- 

 ing solid lime as the CaOOs forms a crust on top which ef- 

 fectually prevents further absorption of C O 2 . Even in the 

 transferred solution this formation of CaCOs does not per- 

 ceptibly weaken solution if of a depth of eight inches or more. 

 This solution may be used as in the Mann's test, multiplying 

 number of cubic centimeters of lime water used by .45 to get 

 into terms of n-10 alkali. Or recorded results by Mann's test 

 may be divided by this factor to get in terms of lime water, 

 and all results interpreted in terms of C C of lime water rather 

 than n-10 alkali. 



It will be found more convenient to use 25 CC of cream 

 for test on account of the dilute alkali used. Multiply results 

 by 4 to get in terms of alkalinity per 100 C C. 



If percentage of acid (calculated as lactic) is desired, con- 

 vert lime water used into CC n-10 alkali per 100 CC of milk, 

 that if 25 CC milk or cream were used, multiply by .45 and 4, 

 and multiply results so obtained by .009. Kesults, Gms. lactic 

 acid per 100 CC. 



A simple method will be, when using 25 CC milk, to mul- 

 tiply cubic centimeters of lime water by 0.0162. If, as for 

 instance, there has been used 12.2 CC lime water, the acid 

 per centage is (with three decimals) 0.198. In ordinary cream- 

 ery work no calculation need be made. 



E. N. EATON. 



TESTING HEATED MILK. 



In Denmark the compulsory pasteurizing law made it 

 necessary to devise a test, which, if applied to milk cream 



