334 



FARM AND SCHOOL PROBLEMS. 



COTTONSEED MEAL. 



In 100 In i 



Pounds Pound 



Dry matter 93.0-=- 100 X 1= 0.93 



Crude protein 37.6^-100X 1= 0.38 



Carbohydrates 21. 4-^ 100 X 1= 0.21 



Fat 9.6-hlOOX 1= 0.10 



Tabulating these results we have the following : 



Exercises. 



1. Heat a small piece of fresh lean meat in a long test tube. Ob- 

 serve the water as it rises and collects on the cooler parts of the vessel. 

 Weigh before and after heating. What does this experiment prove? 



2. Perform the same experiment as in exercise 1, except that wood 

 is to be used instead of meat. 



3. To find protein in wheat. Make stiff dough of wheat flour. 

 Wash the dough in cold water; this will remove the starch. The re- 

 mainder will 'be very elastic ; this is chiefly protein called gluten. 



4. Chew grains of wheat until the starch has been dissolved and 

 the "gum" which is left is chiefly gluten. 



5. 'Examine other forms of protein, as white of egg, both raw 

 and cooked. 



6. Make wet paper balls of different kinds of paper. Remove the 

 starch with water. What remains is fiber or cellulose. 



7. Examine small grains, as corn, wheat, etc. Cut open the ker- 

 nels. The White powder is nearly pure starch. 



8. Boil maple syrup, or sap, cane sap, sugar-beet sap, grape juice, 

 apple cider until they form sugar. 



