20 MILK-ANALYSIS. 



water, and discharged into a counterpoised beaker or flask, 

 which, with its contents, is to be weighed. The discharged water 

 should not differ from 5 grammes by more than 0.02 grammes. 

 In order to be able to take milk-solids, the experimenter 

 requires 



1. A balance. 



2. Small platinum dishes. 



3. Water bath. 



4. Pipette. 



If a good chemical balance and weights be at hand, so 

 much the better. If not, and the question arise relative to 

 the least practicable expenditure in the matter of balance, 

 the following information may possibly be acceptable. 



I have seen a balance made by Becker & Sons, of New 

 York, and Kruiskady, Rotterdam,* which indicates two milli- 

 grammes quite distinctly when loaded with fifty grammes, and 

 which costs 2. This balance, which is No. 14 on Messrs. 

 Becker & Sons' published catalogue, will answer very well. 

 For weights, it is essential to have a good set, and the box 

 costing 80s. will be required. 



If 5 c. c. of milk be taken, it will be obvious that an error 

 of five milligrammes equals 0.1 gramme per 100 c. c. ; and 

 with a balance and weights and pipette, such as just men- 

 tioned, there should be no difficulty in getting determina- 

 tions of residue which are not more than a few hundredths 

 per cent, off the truth. The evaporation to dryness is most 

 conveniently performed in a small platinum dish weighing 

 some twelve grammes, and of the size figured. 



If there be many milks to examine, it will be well to have 

 a set of the little dishes (which cost 14s. a piece, and which 

 are numbered on the lip). The dishes are to be cleaned and 



* Mr. Henry Gillman, 143 Brecknock Road, London, N., is sole 

 agent in England. 



