40 BULLETIN 132, U. S. DEPARTMENT OF AGRICULTURE. 
5. Find the value of the elements in a ton of cottonseed meal at the prices mentioned 
in problem 2. 
6. Find the amounts of 16 per cent phosphate, 19 J per cent nitrate of soda, and 12 
per cent kainit required to compound a ton of 9:2:4 goods. What amount of filler 
will be required to complete the ton? 
7. Find the amounts of 14 per cent phosphate, 2:7:1 J cottonseed meal, and 50 per 
cent muriate of potash required to make a ton of 8:3:3 goods. 
FEBRUARY. 
1. Spraying materials usually cost as follows: Lime, 1 cent per pound; copper sul- 
phate, 10 cents per pound; Paris green, 30 cents per pound; arsenate of lead, 15 cents 
per pound; kerosene, 13 cents a gallon; hard soap, 10 cents per pound; lime-sulphur 
mixture, 15 cents per gallon. 
2. Find the cost of the following formula: 
5 pounds lime 
5 pounds copper sulphate 
50 gallons water 
Total 
3. Find the cost of the following formula: 
2 gallons kerosene 
1 pound hard soap 
1 gallon water 
Total 
i. Find the cost of the following formula: 
3 pounds arsenate of lead 
50 gallons water 
Total 
5. If it takes three applications of 2 pounds of arsenate of lead and three days' time, 
at $1.25 per day, to destroy the Colorado beetles on an acre of potatoes, how many 
bushels of potatoes, at 50 cents per bushel, will be required to pay for the treatments? 
6. A boy failed to select and test the vitality of his seed corn and secured only 
three-fourths of a regular stand . His yield was 60 bushels. What should it have been 
if his stand had been regular? 
7. If two days had been required to select and test the corn seed in problem 6 and 
thereby secure a regular stand, what would have been the value of the boy's time 
per day? 
MARCH. 
1. For the school garden plats 15 girls want 10 tomato plants each, and the plants 
should stand Ih inches each way, what should be the area of the cold frame? 
2. Determine the cost of such a frame. 
3. What would be each girl's share of the cost? 
4. A boy who is a member of both corn and pig clubs follows a 3-year rotation coarse 
with 3 acres of land. To utilize his grazing crop each year it is necessary for him to 
have a portable hog fence of sufficient length to inclose an acre. If it requires 60 
rods of fence at 35 cents per rod and 80 posts at 10 cents apiece to construct the fence, 
what will be the cost of material? 
5. If the above boy's temporary pea pasture will support a sow and six pigs, what 
will each of the pigs have to bring at 10 weeks old to pay for his temporary fence? 
APRIL. 
1. In a 3-year rotation course of corn, cotton, and oats and peas, one-fourth ton of 
stubble and one-fourth ton of pea vines are turned under. What is the fertilizing 
value if 1 ton of pea vine provides 40 pounds nitrogen, 10 pounds phosphoric acid, 
