Quarterly Report of the Chemical Committee, jane, 1893 . 365 
practically none whatever, which would not be the case were any soot 
mixed with it. The exact percentage of nitrogen in the sample is *08 per 
cent. 
Under threat of legal proceedings Mr. Adams paid the bill. 
The following case affords an instance showing that even when 
an invoice has been given in approved terms it is still necessary to 
resort to analysis. 
4 . Captain R. Boutflour, of AVhelly Hill, Castle Eden, co. Dur- 
ham, sent on April 25 a sample of what had been invoiced to him 
as Vitriolated Bones. 
Two tons of this had been purchased at Gl. 15s. per ton carriage 
paid, less 5s. per ton net cash, the vendor and manufacturer being 
Mr. William J. Stephenson, Pipewellgate Chemical Manure Works, 
Gateshead-upon-Tyne. 
A circular sent by the vendor contained the following guarantee 
of analysis : “ Vitriolated Bones, price 71. 5s. per ton. 32 to 37 per 
cent, total phosphates. 15 to 20 per cent, soluble phosphate. Nitro- 
gen=10 to 12 per cent, sulphate ammonia.” 
Dr. Voelcker gave the following report 
May 3, 1893. 
i 
Moisture ....... 
Organic matter aud water of combination 
Monobasic phosphate of lime .... 
equal to tribasic phosphate of lime (bone phos- 
phate) rendered soluble by acid . 
Insoluble phosphates ..... 
Sulphate oflime, alkaline salts, &c. 
Insoluble siliceous matter .... 
. 15-84 
. 19-48 
. 12-47 
j. (19-53) 
. 10-00 
. 37-09 
. 5-12 
10000 
1 containing nitrogen ..... 1-58 
equal to ammonia . . . . . . 1'92 
This is not made, as vitriolated bones should be, of raw bone and acid 
only. The price is distinctly high. 
On receiving this report Captain Boutflour wrote : — 
AVhelly Hill, Castle Eden : May 8, 1893. 
Dr. J. Augustus Voelcker. 
JIeak Sir, — The manufacturer of the Vitriolated Bones called upon me 
on Saturday last, and in explanation said that the 4^ per cent, soluble 
phosphates over minimum guarantee would equal 9 per cent, insoluble — 
making phosphates 15-34 respectively — leaving the deficiency in ammonia 
the same, and allowing 2 per cent, of total phosphates, as a set-oil' against 
the deficiency in ammonia would leave it only i per cent, short, and, further, 
he contended that the ammonia is solely from hones. Would you kindly say 
what you think the value of this manure should he? — I am, Sir, yours 
respectfully, Robert Boutflour. 
