LESSON FOR THE FARM 



Published semi-monthly throughout the year by the New York State College of 

 Agriculture at Cornell University. Entered as second-class matter October 13, 

 191 1, at the post o£Bce at Ithaca, N. Y., under the Act of Congress of July 16, 1854 



L. H. Bailey, Director 

 Course for the Farm, Royal Gilkey, Supervisor 



ITHAC\ N Y 



VOL I. No. 16 MAY iV IQI2 ' DAIRYING SERIES No. i 



PRACTICAL DAIRY PROBLEMS 



H. E. Ross, E. S. Guthrie, and W. W. Fisk 



The object of this bulletin is not to teach arithmetic, but to apply its 

 principles to dairy work. The successful dairyman must keep close watch 

 of every operation in his business. This applies just as much to the small 

 dairyman as to the operator of a large dairy plant; for, while the total 

 loss in a small dairy plant may not be great, the percentage loss is just as 

 great as, and in many cases greater than, in a large one. 



In this lesson the principles of arithmetic have been applied to practical 

 problems. This makes the bulletin more helpful in aiding the dairyman 

 to understand his business better. In many cases the problems are based 

 on figures taken directly from creamery records. 



For the purpose of ready reference an index is given at the end of the 

 lesson. 



CONVERTING POUNDS TO QUARTS AND QUARTS TO POUNDS 



In converting quarts of milk to pounds or pounds to quarts, it is necessary 

 to know that a quart of milk weighs 2.15 pounds. While it is true that 

 the composition of milk is variable, the variation in weight is not great 

 enough to affect the practicability of always calling the weight of one 

 quart of whole milk 2.15 pounds. 



The weight of a quart of cream is not constant because the percentage 

 of fat in cream is very variable. The following table gives the weight 

 of a quart of cream of different percentages of fat : weight of Weight d 



one quart of one gallon 

 cream in of cream 



Percentage of fat p^^unds In pounds 



20 2. 115 8.460 



25 2. TO 8.40 



30 2.088 8.352 



40 2.055 8.2 20 



50 2.028 8. 112 



fl529l 



