34 



DAIRY ANALYSIS 



from which the quantity of milk sugar can be found by. 

 the table below ; this multiplied by 200, and divided 

 by the weight of milk taken, gives the percentage of 

 milk sugar. 



TABLE IV 



FOR CALCULATING WEIGHT OF MILK SUGAR FROM 

 COPPER REDUCED 



(All weights are in milligrammes) 



Estimation of Proteins. These may be estimated 

 together by Ritthausen's method, or the casein arid 

 albumin may be separated ; indirect estimations may 

 be made from the nitrogen by Kjeldahl's method, from 

 the "aldehyde figure/' or from the organic phosphorus 

 and sulphur. 



The Ritthausen Method. Pipette IQC.C. of milk into 

 a beaker, and add 100 c.c. of hot water ; add 5 c.c. of 

 Fehling's copper sulphate solution (see Appendix), and 

 neutralise with caustic soda solution ; collect the 

 precipitate either in a weighed Gooch crucible, or on 



