68 QUESTIONS AND ANSWERS 



Give four formulas used in determining the solids 

 not fat in milk. 



1 L+ 7F __ gQ^^is j^Qt fat. 



2 ^ + .2 F + .14 = solids not fat. 



4 



3 J + .2 F = solids not fat. 



L + F 



solids not fat. 



^ 4 



In each of these formulas L=lactometer read- 

 ing and F=fat. 



How do the results secured by the different 

 formulas compare? 



No. I gives the highest results, while No. 3 gives 

 the lowest. Nos. 2 and 4 give about the same re- 

 sults excepting on rich milks, when No. 4 gives 

 results that are nearly as high as those secured 

 with formula No. i. 



With what class of milks does each of the formulas 

 give best results? 



Formula No. i gives results that correspond 

 fairly well with chemical analysis for milks having 

 a Quevenne lactometer reading of 33 or more and 

 having more than 4.5 per cent of fat. Formula 

 No. 2 gives its best results in milks having a 

 Quevenne reading between 31 and 33 and a fat 

 content between 3.7 and 4.5 per cent. 



Formula No. 3 gives best results on all milks 

 having a Quevenne reading of less than 31 and a 

 fat content of 3.7 per cent or less. 



Formula No. 4 will give good results with milk 

 of average quality or richer milks. 



