Reports of the Chemical Committee. 427 
This g^uano was bought at the full market price of 14/. 5^. cash. 
It is genuine, but damaged by water, and worth about 25s. to 
oOs. less per ton than good Peruvian guano. 
Moisture 16-04 
*Or<.;anic matter and salts of ammonia 41'38 
Phosphate of lime 20-81 
Alkaline salts 9-32 
Insoluble siliceous matter 12-45 
1-000 
* Containing nitrogen 9-65 
Equal to ammonia 11-71 
The bulk of this guano was delivered in a very damp state, 
and with a quantity of stone. The quality was guaranteed first- 
class Peruvian guano, and the price charged 14/. per ton. It is 
genuine Peruvian guano damaged by water, and, apart from the 
larger stones, contains 12^ per cent, of fine siliceous matter (rock), 
and yields only 11;| per cent, of ammonia, instead of 14J to 15 per 
cent., which Peruvian guano of good quality at present contains, 
on an average. 
The Committee next direct attention to the following ana- 
lysis, showing the composition of a sample of British guano, 
sent to Dr, Voelcker by Mr. H. Robbins, Northfield Farm, 
Witney : — 
Moisture 2G-80 
*Organic matter 11*09 
Phosphate of lime -65 
Oxide of iron and alumina . . 2*94 
Carbonate and sulphate of lime 47-26 
Alkaline salts and magnesia 1-72 
Insoluble siliceous matter 9'54 
100-00 
Containing nitrogen "53 
Equal to ammonia -64 
This so-called guano is sold as Pound's British Guano, at 
High Street Bromley, Bow, E., at 3/. 10s. per ton, and is de- 
scribed by the maker as " an extraordinary scientific combination 
of night-soil, sulphate of lime, and bones, possessing immense 
body, which gives it great durability and feeding power, whilst 
no known manure can compare with it in quantity of fixed 
ammonia." The preceding analysis, however, shows that the 
sample sent to Mr. Robbins contains merely a fraction of 1 per 
cent, of ammonia and phosphate of lime, and is all but worth- 
less as an artificial manure. Its strong smell is chiefly due to 
animal or bone-oil. 
As an instance of the caution that is requisite on the part of 
agents for the sale of manures, the Committee wish to call atten- 
VOL. VI. — S. S. 2 a 
