314 Annual Report of the Consulting Chemist for 1879. 
guano. The weight of stones in guano may be considerable, 
as will appear from a letter which I received a short time ago 
from a gentleman, informing me that the weight of stones in 
4 tons of guano bought by him amounted to 6 cwts. and 2 lbs. 
Artificial Manuees and Superphosphates. 
As usual, a number of inferior artificial manures were received 
for analysis during the past season, some of which were not only 
sold under wrong or misleading names, but also at far too high a 
price. Thus, a sample of manure which was sold under the 
name of turnip-manure at 11. Is. a ton, on analysis was found to 
have the following composition : — 
Moisture 21-30 
Water of combinatiou 10" 73 
Monobasic phosphate of lime 12*78 
(Equal to tribasic phosphate of lime] ^<jq.qo\ 
rendered soluble by acid) .. •• | " 
Insoluble phosphates 9 '58 
Sulphate of lime, &c 3!) 'Go 
Insoluble siliceous matter 5"96 
100-00 
In point of fact this turnip-manure was nothing more or less 
than a badly made mineral superphosphate, of a quality which 
can be readily bought in most places at 4?. a ton, or at consider- 
ably less money in localities favourably situated as regards the 
supply of superphosphate. The demand of 11. Is. for a mineral 
superphosphate which would be dear at 4Z. a ton, is quite incon- 
sistent with fair dealings. 
In proof of the assertion that this turnip-manure, or rather 
mineral superphosphate, would have been dear at 4Z., I quote the 
results of the analysis of three samples of artificial manures for 
roots which a member sent me last June. The three manures 
had the following composition : — 
No. 1. 
No. 2. 
No. 3. 
22.85 
18-58 
14-70 
Organic matter and -water of combustion 
8-41 
1105 
9-30 
20-68 
18-07 
6-41 
(Equal to tribasic phosphates rendered soluble) 
(32-37) 
(28-29) 
(10 04) 
6-94 
5-18 
8-97 
39-54 
40-84 
55-34 
1-58 
6-28 
5-28 
100-00 
100-00 
100-00 
