Reports of the Chemical Committee. 429 
bone whatever, or but very little, are sold this season professing 
to be made from bone. The following case is an illustration of 
this fact : — 
Composition of a sample of Superphosphate advertised as made 
from bone, sent hy Mr. S. Bi-oicne, Brockton, near Sliifnal, 
Salop, hoiKjht from Mr. George Dawler, Plume Works, Aston, 
Birmingham, at 71. per ton : — 
Moisture ll-TG 
Water of combination and *Organic matter .. .. 25"33 
Bipliosphate of lime (monobasic phosphate of lime) I'tiO 
Equal to bone phosphate (tribasic phosphate of 
lime), rendered soluble by acid, 2'56 
Insoluble phosphates (coprolite powder) .. .. 17"91 
Sulphate of lime 28"27 
Alkaline salts and magnesia (common salt) .. .. 5"18 
Insoluble siliceous matter 9"86 
100-00 
* ContainiDg nitrogen •56 
Equal to ammonia "68 
Practically this bone-superphosphate contained no bone, but 
was a badly made coprolite superphosphate, containing only 
2^ per cent, of soluble phosphate. It would be dear at 3/. 3s. 
per ton. 
Cake is often sold as genuine linseed-cake, which is either 
made from inferior and undressed seed, or it is mixed with other 
articles. The following is a good example of one of these cases. 
Mr. Dudfield, A. of Catsley, Bewdley, forwarded a sample 
of cake branded genuine," bought from Mr. Firmston, Stour- 
bridge, price 10/. 155. per ton, and manufactured by Walker 
and Smith, of Hull. The analysis is as follows : — 
Moisture 12-30 
Oil 9-(39 
*Albuminous compounds (flesh-forming matters) .. 32-50 
Mucilage, sugar, starch, and digestible fibre .. .. 26-16 
"Woody fibre" 12-03 
Mineral mattter (ash) 7-32 
100-00 
*Containing nitrogen 5*20 
This cake was found to be made of dirty linseed, and to be 
mixed with earth-nut cake. A correspondence on the subject 
with Mr. Dudfield ensued, and the Committee think it right to 
that gentleman and the manufacturers to publish the last letter 
received from him : — 
2 G 2 
