114 MANUAL OF GENEEAL AGEICULTUEE. 



Weigh the milk. Calculate the number of pounds of skim 

 milk that must be added to bring the milk to the standard 

 of 3.5%. (Figure on a test of 3.6 since it is unsafe to risk 

 selling milk at exactly the standard as some of the milk 

 delivered may fall below.) Add the calculated amount of 

 skim milk, then test the standardized milk to see if it 

 tests 3.6. 



REFERENCES FOR CLASS STUDY. 

 The first books in the list for each part will be found 

 more satisfactory for high school work. 



Parts I and II 



Fletcher, S. W. Soils. 



Snyder, H. S. Soils and Firtilizers. 



King, F. F. The Soil. 



Roberts, I. P. Fertility of the Land. 



Voorhees, E. B. Fertilizers. 



Hopkins, C. G. Soil Fertility and Permanent Agri- 

 culture. 



Hilgard Soils. 



The Soil Bulletins of the U. S. Department of Agri- 

 culture. 



Bailey, L. H. Cyclopedia of American Agriculture. 



Part III 



Snyder, H. S. Chemistry of Plant and Animal Life. 

 Bailey, E. H. S. Sanitary and Applied Chemistry. 

 Snyder, H. S. Chemistry of Plants. 

 Bulletins of the U. S. Department of Agriculture. 



Part IV 



Wickson, E. J. California Fruits and How to Grow 

 Them. 



Bailey, L. H. Principles of Fruit Growing. 



Warren, G. F. Elements of Agriculture. 



Waugh, F. A. Systematic Pomology. 



Hume, H. H. Citrus Fruits and Their Culture. 



Lodeman, E. G. Spraying Plants. 



Osterhout, W. J. V. Experiments with Plants. 



