Quarterly Reports of the Chemical Committee. 325 
Ultimately Mr. Baker agreed to a compromise with the agent 
from whom he bought it, to pay for the nitrate on the basis of 
Dr. Voelcker s valuation. 
5. Two samples of Black Sea rape cake, warranted to be 
pure rape, on analysis were found to consist not only of crushed 
rape seed, but mainly of the dirt and small weed seeds which 
are sifted out of oily seeds in cleaning them for the market. 
The cakes sent for analysis contained nearly 10 per cent, of 
sand, and less nitrogen than good and genuine manure rape cake. 
Attention is directed to these cases chiefly because the 
application to the land of such rape cakes may do much mis- 
chief in sowing a plentiful crop of weeds unless especial care be 
taken to destroy the germinating power of the numerous small 
weed seeds of which the bulk of these cakes consists. 
6. The following case has no reference to adulteration, but 
is given as a striking illustration of the advantage which a 
farmer may derive from buying manures of well-known character 
and definite composition, and mixing them together in certain 
proportions, in preference to buying similar mixtures in the 
form of compound artificial manures. 
A member of the Society sent two samples of artificial 
manures which had the following composition : — 
Moisture 
*Organic matter and salts of ammonia 
Monobasic phosphate of lime 
Equal to tribasic (bone phosphate) phos- 
phate of lime 
Insoluble phosphates 
tSulphate of lime and alkaline salts . . 
Insoluble siliceous matter 
*Coutaining nitrogcu .. 
Equal to ammonia . . 
flucluding nitrate of soda 
The sample marked No. 1 was made on the farm by mixing 
together sulphate of ammonia, concentrated superphosphate, 
bone-meal, and nitrate of soda, in the following proportions and 
<^osts:— £ , ^_ 
One ton sulphate of ammonia, at per ton .. .. 17 10 0 
One ton nitrate of soda, at per ton 13 113 
Two tons of superphosphate, containing 35 per cent.) o ia a 
of soluble phosphate, at 4Z. 15s ^ J iu u 
Two tons of fine bone-meal (boiled), expected to] 
contain 2i per cent, of ammonia, and 50-55 per| ll 11 8 
cent, of phosphate of lime, at 11. 5s. \Qd. per ton j 
£55 2 11 
No. 1. 
No. 2. 
8-71 
11-51 
24-49 
29-73 
8-08 
11-09 
(12-66) 
(17-52) 
16-15 
17-63 
40-66 
25-25 
1-91 
4-79 
100-00 
100-00 
4-91 
4-02 
5-06 
4-88 
1461 
1.20 
