On Chalk 3farl. 



547 



Per Cent. 



Carbonic acid ...... none. 



Sulphuric acid ...... traces. 



Phosphoric acid ...... ditto. 



Chlorine 0-03 



Lime . . . . . . .0*66 



Magnesia 0*77 



Potash . , 0-66 



Soda -15 



Protoxide and peroxide of iron . . . 3*16 



Alumina . . ... . . . 1 * 24 



Insoluble in Acids, 69 • 00 :— 



Lime trace. 



Magnesia ditto. 



Potash 1-53 



Soda 1-90 



Alumina with a little oxide of iron . . ]9'06 



Silicic acid and sand ..... 46' 51 



100-00 



No. 2. The Middle Gaiilt. — This is a stiff clay, of a bluish grej 

 colour, and is usually more extensively developed than No. 1. 

 Small nodules of carbonate of lime are pretty generally inter- 

 spersed throughout it. Fossils, very rich in phosphate of lime, 

 are also frequently met with, but they are in so complete a state 

 of preservation, so intensely hard, that they probably exercise 

 very little influence on its vegetation. This marl or clay has 

 been extensively used on light soils, which it greatly improves, 

 more so even than the lower gault — most likely by reason of the 

 greater proportion of lime which it contains. When deeply and 

 thickly drained it produces the very best crops of hops, wheat, 

 beans, oats, and every variety of root crops. In its natural state it 

 grows oak trees of magnificent size. 



Per Cent. 



6-38 



26-89 

 3-13 

 0-30 



trace. 



ditto. 



5- 34 

 0-35 

 0-74 



•31 

 7-25 



6- 50 



* In selecting a sample for analysis the phosphoric fossils were rejected. 



2 N 2 



Analysis of the Middle Gault (No. 2). 



Combined water with a little organic matter . 

 Soluble in dilute acids, 50*81 : — 



Silicic acid (silica) . . , . . 

 Carbonic acid ...... 



Sulphuric acid ...... 



Phosphoric acid* 



Chlorine . . . . 



Lime ........ 



Magnesia . . ... 



Potash ....... 



Soda 



Protoxide and peroxide of iron 



Alumina ....... 



