Reports of the Chemical Committee. 
425 
It will be noticed that tliis example of so-called bone manure 
contained only 1 per cent, of phosphate of lime, and 1 per cent, 
of nitrogen. It contained 20 per cent, of water, and consisted 
mainly of gypsum and some cheap organic refuse, impregnated 
with sulphuric acid, and is not Avorth more than 30s. to 35s. per 
ton as a manure. 
Mr. Bacon informs me that he bought the manure from a 
Mr. Ralph Potts at 4/. 10s. per ton, and invoiced at 4/., and that 
it was guaranteed to be bone manure, prepared by Mr. George 
Birch, manufacturer of all kinds of bone and special manures 
for every crop, Woodcock Street Works, No, 1, Heneage Street, 
Birmingham. 
II. A second sample of bone-dust was sent for analysis by Mr. 
J. Borlase Tibbets, Barton Seagrave, Kettering, who bought it at 
11. Is. from Messrs. Ellis and Everard, Leicester, as \ inch bones. 
The following is the composition of this bone-dust : — 
Moisture 9-94 
*Org;anic matter 7'74 
Tribasic phosphate of lime 40*12 
Carbonate of lime 17"66 
■Oxide of iron and alumina, magnesia, &c 6'25 
Insoluble siliceous matter (sand) 18-22 
100-00 
* Containing nitrogen -66 
Equal to ammonia -80 
It will be observed that these bones were very poor in nitro- 
genous organic matter, and contaminated with a good deal of 
carbonate of lime and fine sand. Their real value does not 
exceed 5Z. per ton. 
III. The following is the analysis of another sample of bone- 
dust sent to me by Mr. E. D. Broughton, Wislaston Hall, Nant- 
wich, who bought it from Messrs. Bradburn and Co., of Wednes- 
field, near Wolverhampton, through Mr. Thomas Whittingham, 
their agent at Nantwich, at 11. per ton : — 
Moisture 13-52 
Organic matter 22-03 
Phosphate of lime 41-49 
Sulphate of lime 13-75 
Carbonate of lime 2-42 
Alkaline salts and magnesia 3-47 
Sand 3-32 
10000 
* Containing nitrogen .. " 2-71 
Equal to ammonia 3-29 
