Agricultural Education — Examination Papers, 1887. cxxvii 
which for starch, which for sugar ? Give the percentage amount of 
the selected ingredient generally found in the foods named. 
8. Write a short paper illustrative of the influence of climate and 
season on the growth of crops. 
II. General Chemistry. 
Tuesday, May IQth, from 10 a.m. till 1 p.m. 
1. Explain how to find the proportion of (1) oxygen, (2) carbonic 
acid gas, in the atmosphere. 
2. Describe and explain the preparation of chlorine. Chlorine 
often acts as an oxydiziug agent : explain this. 
3. Describe the chief physical and chemical characters of (1) wood 
charcoal, (2) silica, (3) lime, (4) aluminium hydroxide. 
4. Sunshine is said to do work against chemical forces in the 
growth of plants : explain this statement. 
5. Shew how to determine the amount of ammonia in a mixture of 
sulphates of ammonia and soda and lime. 
6. Explain the relation between the compound formed when phos- 
phorus is burnt in air and common phosphoric acid. Also the 
relations between the acids known as ortho-, meta-, and pyro-phos- 
phoric. Give examples of other acids " between which a similar 
relation occurs. 
7. Explain under what circumstances nitrates are formed naturally. 
Determine the percentage of nitrogen in potassium nitrate and in 
calcium nitrate, respectively. (K = 39, Ca = 40.) 
8. State the composition of urea, and give an account of its chief 
chemical characters. How may it bo made to yield ammonia ? 
9. Explain the conditions under which acetic acid is produced. 
Give examjjles of other acids of the same type as acetic acid, and point 
out wherein they resemble one another. 
EXAMINATION IN MENSURATION AND LAND 
SURVEYING. 
Maximum Number of Marks, 100. Pass Number, 50. 
Thursday, May l^ih, from 2 jj.in. till 5 p.m. 
1. State rules for finding the area of a sector of a circle, and of a 
segment of a circle. 
The angle of a sector is 55°, the radius of the circle is 120 ft. ; find 
the area of the sector, and of the segment cut off by the chord sub- 
tending the angle of the segment. 
2. Find in square inches the area of the surface of a globe 20 in. 
in diameter. 
