Agiicullural Education — Examination Papers, 1870. cxi 
calves until six montlis old, with their general management until two 
years old. 
12. State tlic number of Lands required at tlic rick in harvest timo 
to keep two pitchers employed on a good crop of mown wheat, and also 
tho number of horses and carts, or horses and waggons, supposing the 
field to bo half a mile from the rick yard. 
Afternoon, viva voce examination commencing at 2 o'cloch. 
EXAMINATION IN CHEMISTRY. 
MAXIMUM NUMBEU OF MAEKS, 200. PASS NUMBER, 100. 
I. General Chemistry. 
Wednesday, April 27tli ; Morning, 10 a.m. till 1 p.m. 
1. Explain the reason of the difference of the temperatures ra- 
dicated by a thermometer with its bulb covered with wet muslin, and 
one which is uncovered. Under what cii'cumstances will there be no 
difference in their indications ? 
2. Explain the formation of dew, and why there is so little dew on 
cloudy and on windy nights ; also, why there is more dew usually on 
grass than on a gravel path. 
3. Describe the elements nitrogen, phosphorus, and arsenic ; com- 
pare them one with another as regards the compounds they form with 
other elements, particularly with hydrogen and oxygen. How may 
ammonia be obtained from nitric acid ? 
4. Describe the preparation of (1) hydrochloric acid, and (2) caustic 
soda. Explain fully how to determine the strength of a solution of 
caustic soda, stating the principle on which the method depends. 
5. By what characters is it shown that the atmosphere is not a 
chemical compound ? Point out the causes which tend to increase 
and to diminish, respectively, the proportion of carbonic acid gas in 
the atmosphere. 
6. State the chemical composition of gypsum and of alum, and 
give the reactions by which they may severally be recognised. 
Explain the formation of the former during the weathering of some 
clays containing pyrites. 
7. Explain how to determine (1) whether an organic substance 
contains nitrogen, and (2) in what proportion it is present. Ten 
parts of a compound gave, on combustion, 7"096 of CO^, 5'807 of 
H^O, and N equal in volume to half the CO'^ ; find a formula for it. 
8. Explain the constitution of fat and of soap. Explain the action 
of the latter with hard water. 
9. In what parts of plants is albumen met with ? Of what elements 
does it consist '? It is said to belong to the class of colloids, explain 
what is meant by this, and illustrate the characters of such compounds 
by examples of inorganic origin. 
