A UNIT IN AGRICULTURE 63 



On plot No. 8, 8 Ibs. of nitrate of soda. 



On plot No. 9, 16 Ibs. of acid phosphate. 



On plot No. 10, 4 Ibs. of muriate of potash. 



Do this work in early spring. Plant the entire plot in corn or 

 potatoes and cultivate carefully. In the fall, gather and weigh the 

 crop. Which plot made the best yield? Which made the poorest? 

 Arrange the plots according to the yield. Considering the market 

 price of the corn or potatoes, did it pay to fertilize? Which plot 

 shows the highest per cent of profit? 



Ex. 68. The Home Garden. 



Make drawing of plan for a vegetable garden to supply the home 



with a succession of vegetables. Indicate the area planted to differ- 

 ent vegetables, the approximate time of planting, distance between 

 rows, method of planting and cultivating. 



Note. It is important that the garden be arranged for cultiva- 

 tion by horse power. 



Ex. 69. Farm Forestry. 



Visit the woods on a farm. Find out what trees the method of 



cutting has favored, and what are the leading kinds, with the pro- 

 portion of each. Learn the names of the common trees. Note that 

 much of the cutting in woods is done in such a way as to leave the 

 undesirable trees the tree weeds. 



Ex. 70. Agricultural Manufacturing. 



Visit a creamery, vinegar factory, evaporator, canning factory or 

 other similar industry. Note the different operations and refer to the 

 scientific principles involved. 

 Ex. 71. The Babcock Test for Butter-Fat in Milk. 



This exercise should first be performed by the teacher as a demon- 

 stration exercise and then by the individual students. 



Caution. Examine the apparatus and read the directions care- 

 fully before using it. When pouring the acid into the milk, be sure 

 that the bottle is not pointed toward yourself or any other person. 



Mix the milk by pouring it back and forth between two vessels 

 several times. Place the small end of the pipette near the center of 



