cxxvi Agricultural Education — Examination Papers, 1887. 
15. When should ewes be put to the ram to lamb down in March? 
16. Give the average weight of a Lincoln or Leicester hog fleece, 
and of a Shropshire hog fleece. 
17. Give the periods of gestation of the following : — Mare, cow, 
ewe, sow. 
18. What amount of food per week should an average cart-horse 
have to keep him in good condition for hard work, and how much in 
slack time ? Give the prices of food in each case, 
EXAMINATION IN CHEMISTRY. 
Maximum Number of Maeks, 200. Pass Number, 100. 
I. Agricultural Chemistry. 
Tuesday, May 10th, from 2 p.m. till 5 i).m. 
1. What are the principal points of difference which would be 
shown in the chemical analyses of the following kinds of soil : — a 
sandy soil, a heavy clay, a loamy soil, a marly soil, a peaty soil ? 
2. What do you understand by the term " nitrification " as applied 
in agriculture '? Explain its action, and illustrate its bearing on 
questions of crop manuring, stating what conditions increase or retard 
its action. 
3. Explain the changes which may take place in the constituent 
parts of soils as the result of " paring and burning." On what kinds 
of soil, and under what circumstances is the operation conducted with 
benefit, and when would it be disadvantageous ? 
4. Describe in chemical language the different forms in which 
phosphoric acid exists in combination with lime in the following 
materials : — raw bones ; steamed bones ; bone dust ; dissolved bones ; 
ground coprolites ; mineral superphosphate ; precijiitated jihosphate ; 
apatite ; Peruvian guano. 
Compare these materials as regards the action and value of the 
phosphates they severally contain, mentioning circumstances that may 
produce varying results. 
5. What is " basic cinder," or, as sometimes termed, " Thomas' 
phosphate powder " ? How, and under what circumstances is it 
obtained commercially? On what grounds may it be considered a 
manurial substance of value, and what circumstances may affect this 
value ? 
6. Give approximate analyses showing tho differences of chemical 
composition between the following : — milk ("cow's) ; colostrum ; 
cream ; skim-milk ; butter ; cheese (rich) ; cheese (from skim-milk). 
7. What feeding materials in common use are specially useful on 
account of the oil they contain, which for the nitrogenous constituents, 
