236 M. C. Rayner , W. N. Jones and J. W. Tayleur. 
to the distribution, detailed analyses were made of the soils from 
four stations. 
A. Soil from heather area near Y 5 . 
B. Soil from grass patch in heather near Y G . 
C. Thin soil over chalk near Y^ 
D. Soil over clay-with-flints outside the heather area. 
For comparison with the above, three typical soils have been 
chosen. 
E. Soil from a chalk down in Dorset. F. Stiff arable loam 
from Milbourne, Dorset, on clay-with-flints, and G a poor soil on 
the Bagshot Sand from Broadstone Heath, Dorset, on which 
Calluna is naturally abundant. 
The detailed analyses, mechanical and chemical, of these soils 
are given in the following Table. 
TABLE II. 
Berkshire and Wiltshire Downs. Dorset. 
/" N ^ v. 
Station. 
A 
B 
C 
D 
E 
F 
G 
Nature of Situation. 
Heather 
Area. 
Grass in 
Heather. 
Soil over 
Chalk. 
Loam and 
Flints. 
Chalk 
Down. 
Stiff, 
Loam. 
Waste 
Common. 
Locality. 
Botley. 
Botley. 
Botley. 
Botley. 
Cerne 
Abbas. 
Mil- 
bourne. 
Broad- 
stone 
Heath. 
Geological Formation. 
Clay with 
Flints. 
Clay with 
Flints. 
Upper 
Chalk. 
Clay with 
Flints. 
Upper 
Chalk. 
Clay with 
Flints. 
Bagshot 
Sands. 
A.—Mechanical Analysis of 100 parts of air-dry soil. 
Stones more than 4" dia. 
27-4 
20-6 
11-2 
•9 
9-0 
70 
110 
1 It 
>> n 10 >> 
15-2 
5-2 
20 
1-5 
— 
— 
— 
Chalk . 
•1 
— 
31-3 
— 
— 
— 
— 
Fine Earth, less than T V' 
57-3 
74-2 
55-5 
97-6 
910 
930 
890 
B.—Mechanical Analysis of 100 parts of air-dry fine earth. 
Moisture ... 
3-97 
5-41 
4-15 
4-71 
2-0 
30 
1-2 
Organic Matter ... 
12-57 
13 92 
18-42 
12-16 
91 
7-9 
6-3 
Calcium Carbonate 
— 
— 
41-80 
— 
540 
•36 
•05 
Fine Gravel, 3-1 mm. ... 
1-65 
1-46 
1-30 
•84 
1 
Coarse Sand, -12 mm. 
2-90 
1-90 
1-38 
2-80 
1- 18-0 
600 
81-5 
Sand, -2--05 ,, 
22-80 
23-50 
5-67 
27-40 
J 
Silt, -05--01 „ 
33-90 
30-75 
12-31 
34-70 
7-9 
171 
4-5 
Fine Silt, -01--005 ,, 
14-25 
13-95 
5-75 
11-44 
| 
Clay . 
7-55 
8-60 
5-67 
4-67 
l 90 
12-0 
6-5 
Loss on Solution 
•41 
•51 
3-55 
1-28 
J 
