1855.] HULL ON THE COTTESWOLDS. 495 



APPENDIX. 



Composition of Soils from the Cotteswold Hills. By Dr. 

 Augustus Voelcker, of the Royal Agricultural College, 

 Cirencester. 



No. 1. — From the College Farm. A heavy reddish-brown loam ; H foot deep ; 

 off Great Oolite. (Good wheat soil.) 



Water 10254 



Organic matter and water of combination 6*943 



Insoluble siliceous matter 37'091 



Soluble silica (soluble in dilute caustic potash) 14'018 



Oxides of iron and alumina , 12*754 



Lime 10*440 



Magnesia '195 



Potash -967 



Soda -309 



Phosphoric acid '659 



Sulphuric acid '234 



Carbonic acid and loss 6*156 



100*000 



No. 2. — Poor soil ; 6 inches deep, resting on Great Oolite. (Air-dried state.) 



Organic matter and water of combination 6*339 



Insoluble siliceous matter 28*947 



Oxides of iron and alumina 9*311 



Carbonate of lime 58*566 



Potash and soda 1*032 



Phosphoric and Sulphuric acids traces 



Magnesia traces 



100-195 



No. 3. — Soil ; resting upon yellow clay. 



Moisture 9*26 



Organic matter and water of combination 3*17 



Insoluble silicates 66*47 



Soluble silica 1*16 



Oxides of iron and alumina 15'32 



Carbonate of lime 4*12 



Carbonate of magnesia '24 



Alkaline salts '22 



Loss "04 



100*00 



ported detritus, it would be necessary to infer another submersion of the land to a 

 depth of 700 feet, in addition to those mentioned above ; but, as there is strong 

 evidence for considering the " Warp-Drift " to be merely the product of decom- 

 position, it would be rash to infer a third submersion on such grounds alone. 



