cxii Afjiicultural Education — Examination Papers, 1870, 
II, In Agricultural Chemistry. 
Wednesday, April 21tli; Afternoon 2 p.m. till b p.m. 
1. State the method of determining tlie quantity of phosphoric acid 
present in a soil or in a rock. 
2. Which arc the chief differences in the composition of phosphatio 
guanos and Peruvian guano. 
3. Exjilain the formation of nitrates in compost heaps. 
4. Instead of Peruvian guano, a farmer wishes to di'ess his wheat 
with sulphate of ammonia, or with nitrate of soda ; how much sul- 
phate of ammonia, or how much nitrate of soda must he use in order 
to apply to his land the same quantity of nitrogen which is contained 
in 3 cwts. of Peruvian guano ? 
5. What is the reason that sulphate of ammonia may be applied to 
wheat with advantage dui'ing the months of December and January, 
whilst, as a rule, nitrate of soda should not be used before the end of 
March ? 
6. How do you estimate the nutritive and the manurial value of 
oilcake, corn, and other kinds of cattle food ? 
7. Describe briefly the properties of the principal constituents 
of milk, 
8. How do you detect the adulteration of common salt in nitrate 
of soda. 
EXAMINATION IN MECHANICS AND NATUEAL 
PHILOSOPHY. 
MAXIMUJI NUMBER OF MARKS 200. PASS NUMBER 100. 
Thursday, April from 10 a.m. till 1 p.m. 
1. What is meant by the moment of a force with respect to a 
point? If a body is fixed at one point, round which it can move 
quite freely, and is kept at rest by forces acting in a plane passing 
through that point, what relation must exist between the forces ? 
2. A rod (AB), 12 feet long, can turn freely round one end (A) ; 
it is in a horizontal position ; a force of 3 lbs. acts on it vertically 
downwards at a point 4 feet from A ; a force of 7 lbs. acts on it 
vertically upwards at 8 feet from A ; each foot of the length of the 
rod weighs |^ lbs., what force acting vertically at B will keep the rod 
in a horizontal position ; and does it act upward or downward ? 
3. A triangular board (ABC) is suspended by a string fastened to 
the angle (A). Show by a diagram the position of the triangle. If 
the triangle weighs 2 lbs., and if a weight of 2 lbs. is fastened to the 
angle B, show by a diagram what is now the position of the triangle. 
4. State the law of the transmission of force through a fluid. 
