VARIATIONS. 



151 



Variations of Fat with Solids not Pat. — Speaking very 

 generally, a high percentage of fat is accompanied by a high 

 percentage of solids not fat. Vieth gives the following table : — 



TABLE XVII. 



Total Solids. 

 Per cent. 

 Milk containing 12 '5 contains on the average 

 12-7 

 I* it 1^ " »> »> 



») )i !•' I >» »» 



fi ,, loo I, I, 



There are, however, very many exceptions to this rule. 



Variation of Proteins with. Pat. — Timpe has stated that 

 the percentage of proteins can be calculated from the fat by the 

 formula P = 2 + 0"35 F., and gives 21 analyses of " normal 

 milk " from single cows in support of the statement. The com- 

 position of these is : — 



TABLE XVIII. 



Total solida. 

 Fat, 

 Sugar, 

 Protein, . 

 Ash. 



When his series is extended the agreement practically dis- 

 appears. The following table expresses the results of over 

 50 analyses in a condensed form : — 



TABLE XIX. 



