VARIATIONS OF FAT AND PROTEINS. 



297 



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 LII. 



Total Solids. 



Per cent. 



Milk containing 12-5 contains on the average 



12-7 



12-9 



,. 13-1 



13-3 



Fat. Solids not Fat. 

 Percent. Percent. 



3-80 

 3-90 

 4-05 

 4-29 

 4-34 



8-70 

 8-80 

 8-85 

 8-81 

 8-96 



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



Variation of Proteins with Fat. Timpe has stated that 

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

 formula P = 2 -f- 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 LIII. 



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 LIV. 



