98 DAIRY LABORATORY GUIDE 



Example 2: 10 pounds of milk containing 3 per 

 cent fat is to be standardized to 4 per cent. How 

 much skim-milk must be taken from the whole 

 milk? 



10 X .03 = ;30 number of pounds of fat in original 



milk. 

 .30 -T- .04 = 7.5 number of pounds of standardized 



milk. 

 10 7.5 = 2.5 number of pounds skim-milk to be 



separated from the original milk. 



The table on the opposite page by Professor Erf 

 indicates the quantity of skim-milk to be added to or 

 subtracted from 100 pounds of milk to make a de- 

 sired per cent. 



To find the pounds of skim-milk to be added or 

 removed, trace the vertical column of the per cent 

 of fat desired down to where the horizontal column 

 representing the per cent of fat in the milk on hand 

 intersects, and the result will be the number of 

 pounds of skim-milk to be added or removed, as 

 indicated by a plus or minus sign before the re- 

 sult. 



To illustrate: If milk containing 4.5 per cent is 

 desired and milk containing 3.8 per cent is on hand, 

 then 15.5 pounds for every hundred pounds or 15.5 

 per cent of the quantity must be separated out as 

 skim-milk. 



