PENROSE.] 
THOSPHATES OF ENGLAND. 
101 
Carbonic acid 5.64 
Lime 2.01 
Magnesia , 0. 13 
Oxide of iron and alumina 5. 59 
yy. yi 
Analyses of crag -phosphates. 
These average 50 to 60 percent, phosphate of lime (Way). 
[I. Phosphate from the crag at Surrey, by Herapath.] 
Water 3.400 
Organic matter Trace 
Silica with some silicate of alumina and silica of iron 13.240 
Chloride of sodium Trace 
Sulphate of soda Trace 
Carbonate of lime 28.400 
Carbonate of magnesia Trace 
Sulphate of lime 0.736 
Phosphate of lime (tribasic) , 21.880 
Phosphate of magnesia Trace 
Perphosphate of iron 24.760 
Phosphate of alumina 6. 098 
Phosphate of manganese Trace 
Fluoride of calcium „ Some 
Loss . 0.586 
100. 000 
[II. Partial analysis of three Suffolk nodules, by Herapath.] 
Earthy and other phosphates 64. 056 70.545 
Fluoride of calcium 0. 311 2. 554 
Nitrogen Traces 0.0314 
[III. Crag nodules from coast of Suffolk (Herapath).] 
Water with a little organic matter 4. 000 
Salts soluble in water (chloride of lime and sulphate of 
soda) Trace 
Silicic acid, colored red by a little undecomposed silicate 
of iron 5.702 
Carbonate oflime 10.280 
Sulphate of lime Distinct trace 
Phosphate of lime (tribasic) 70.920 
Phosphate of magnesia Trace only 
Perphosphate of iron 6. 850 
Phosphate of alumina 1. 550 
Oxide of manganese Trace 
Fluoride of calcium 0. 608 
100. 000 
Nitrogen 
. 0254 
67. 176 
2. 768 
Undet. 
3.560 
Trace 
6.309 
8. 059 
0.611 
69. oyy 
Trace 
8.616 
2. 026 
0.016 
0.804 
100. 000 
Undet. 
[IV. Suffolk crag phosphate (Herapath).] 
Water driven off at from 300°-350 c F 2.000 
Water and organic matter, expelled at a red heat 9. 000 
Chloride of sodium, etc Evident trace 
(575) 
