328 Experiments in Warren Field, Crdioley-Mill Farm, Wohurn. 
Composiiion of a Samjjle of Dissolved Bone Meal used in the Sicedc 
Experiments at Woburn. 
Moisture 6-20 
•Organic matter and water of combination .. 31 '50 
Monobasic phosphate of lime 14 "72 
Equal to tribasic phosphate of lime (boneK^o.n-x 
phosphate) rendered soluble by acid . . .. J^""*^ ■' 
Insoluble phosphates 15 '69 
Sulphate of lime ) . _^ 
Alkaline salts and magnesia J " ' 
Insoluble siliceous matter 4 "15 
100-00 
'Containing nitrogen 2 • 52 
Equal to ammonia 3-06 
Composition of a Sample of Bedonda Phosphate used in the Swede 
Experiments at Woburn. 
Loss on heating lo"06 
♦Phosphoric acid 23-91 
Lime Traces 
Oxide of iron and alumina 22-84 
Insoluble siliceous matter 38 '19 
100-00 
•Equalto tribasic phosphate of lime .. .. 52-19 
Composition of a Sample of Precipitated Phosphates from a Manu- 
facturer of Glue in Cheshire, at 51. per ton. 
Moisture 28*75 
Water of combination and a little organic) 8*25 
matter J 
, *Phosphoric acid 31 • 44 
Lime 29-80 
Magnesia, &c 1-76 
100-00 
*Equal to tribasic phosphate of lime .. .. C8-G3 
XIII. — Experiments in Warren Field, Crawleij-Mill Farm, 
Wohurn, on the Manurial Value of various Phospliatic Fertilisers. 
By Dr. AUGUSTUS VOELCKER, F.R.S., Consulting Chemist 
to the Royal Agricultural Society. 
In Part I. vol. xvii. of this ' Journal,' an account of experiments 
on Swedish turnips was given. These were instituted mainly 
for the purpose of testing experimentally, on a suflRciently ex- 
tended scale, the comparative manuring properties of finely 
ground coprolites and other mineral phosphates and phosphatic 
