35 



TABLE II. For determining total solids in milk from any 

 given specific gravity and percentage of fat. 



PROPORTIONAL PARTS. 



Directions for using the table. If the specific gravity as 

 expressed in Quevenne degrees is a whole number, the 

 percentage of total solids is found at the intersection of 

 the vertical column headed by this number with the hori- 

 zontal column corresponding to the percentage of fat. 



If the specific gravity as expressed in Quevenne degrees 

 is a whole number and a decimal, the percentage of total 

 solids corresponding to the whole number is first found, 

 and to this is added the fraction found opposite the tenth 

 under ''Proportional Parts." Two examples may suffice 

 for illustration: (1) Fat, 3.8 per cent; specific gravity, 32. 

 Under column headed 32, 12.57 per cent is found corre- 

 sponding to 3.8 per cent fat. (2) Fat, 3.8 per cent; spe- 

 cific gravity, 32.5. The percentage of total solids corre- 

 sponding to this percentage of fat and a specific gravity of 

 32 is 12 .57 . Under ' ' Proportional Parts ' ' the fraction .13 

 appears opposite 0.5. This added to 12.57 makes 12.70, 

 which is the desired percentage. 



An inspection of the table shows that the percentage of 

 total solids increases practically at the rate of 0.25 for each 

 lactometer degree and 1.2 for each per cent of fat. This 

 gives rise to Babcock's simple formula: Total solids= 

 J L+1.2 F. (L=lactometer reading in Quevenne degrees 

 and f= percentage of fat.) 



To illustrate the use of the formula the following ex- 

 ample is given: Fat, 4 per cent; specific gravity, 32. In 

 this case one-quarter of 32 is 8; 1.2 multiplied by 4 is 4.8; 

 8 plus 4.8 equals 12.8, which represents the percentage of 

 total solids. 



