Agricultural Education — Examination Papers, 1880. ci 
action of each of these substances with each (separately) of the other 
two. 
6. "What are the principal products of combustion of (1) a coal fire, 
(2) a candle, (3) a lucifer match ? In making coal-gas considerable 
quantities of ammonia are procured : what becomes of the elements of 
the ammonia when the coal is burnt in an ordinary fire ? 
7. State the relations between cane-sugar, grape-sugar, and starch. 
By what chemical tests can they be distinguished ? Explain the 
chemical changes effected in the fermentation of beer. 
8. What are the distinctive characters of colloid and crystalloid 
substances ? Give examples of such substances. To which class 
do you refer sugar, gum, aluminium hydrate, nitre, ferric hydrate, 
sulphate of ammonia, respectively ? 
9. "What are fatty acids, and what are the properties on account of 
which they are called " acids " ? Explain their relation to fats. 
II. Agricultubal Chemistry. 
Wednesday, April IMh, from 2 p.m. till 5 p.m. 
1. Describe the process of paring and burning and of clay-burning. 
"What are the changes which take place in burning clay ? 
2. Mention some of the chemical and physical peculiarities of clay 
and sandy soils, and show how these peculiarities affect the rational 
cultivation of stiff clay land and light sandy soils. 
3. "Write a short paper on the composition of lime, chalk, marl, 
and shell-sand, and their application in agriculture. 
4. "What arc the effects of salts of potash, nitrate of soda, sulphate 
of ammonia, and superphosphate of lime on the mixed herbage of 
permanent i^asture ? 
5. Mention the general composition of soot. How do you deter- 
mine its agricultm'al and commercial value, and for what crops is it 
most suitable as a manure ? When should it be applied to the land ? 
6. How much have you to pay for the unit per cent, of nitrogen in 
nitrate of soda guaranteed to contain 95 per cent, of pure nitrate of 
soda, and costing 19Z. 10s. per ton, and in sulphate of ammonia, 
containing 24 per cent, of ammonia, and also costing 19/. 10s. a ton ? 
7. Write a short paper on butter-making. 
8. Give an account of the causes of the benefits of growing clover 
as a preparation for the succeeding wheat-crop. 
9. Point out the more striking differences in the composition of 
the following feeding stuffs : — beans, Indian corn, rice meal, oats, 
linseed-cake, decorticated and undecorticated cotton-cake. 
VOL. XVI. — S. S. 
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