134 
W. B. Crump. 
undrained moss occupied by Eriophorutn or Scirpns. It is note¬ 
worthy that both these habitats may exist side by side, or rather 
superimposed, the surface roots of the Callnna never penetrating 
the saturated peat a few inches below the surface. 
No. 166. Moss at Gilpin Bridge, Westmorland, August, 1911. 
Air-dry Peat. Water. 
Wateratl5 n C. Humus. Humus. 
Callnna on surface at 2-5 ins. 112-5% 71-5% 1-57 
No. 165. Foulshaw Moss, Westmorland, August, 1911. 
Air-dry Peat. Water. 
Wateratl5°C. Humus. Humus. 
Eriophorum, &. c. at 6-8 ins. ... 865-2% 75-6% 11-4 
The Callnna Moor is dealt with at length at a later stage. But 
one example may be quoted here to serve as an illustration of the 
average conditions, and for comparison with the next analysis. 
Callnna vulgaris on Callnna Moor, Yorks., August, 1910. 
Air-dry Peat. Water. 
Wateratl5°C. Humus. Humus. 
106 i. Compact peat at 1-2 ins. 78-4% 32-2% 2-43 
ii. Ditto at 2-4 ins. ... 81-9 37-0 2-21 
107. Coarse sand at 4-6 ins. 7-7 3-0 2-53 
The Heath Formation. Though this may approach the Callnna 
Moor on the one hand, its drier examples stand out in strong 
contrast as shewn by the following case where Erica cinerea was 
the dominant plant and the light sand had hardly any covering of 
peat. 
Sandy Heath at Bournemouth, August, 1909. Erica cinerea, 
with Callnna, Molinia and Pines. 
Air-dry Soil. Water. 
Wateratl5°C. Humus. Humus. 
82. Sand at 4 ins. 20-2% 25-6% 0-78 
83. Same at 6 ins. ... ... 8-0 9-1 0-88 
84. Another at 4-5 ins. ... 11-0 13-8 0-79 
Sessile Oak Wood Association. The analyses of Nos. 193-197, 
already given, show the range of soil moisture met with in an oak 
wood. Further examples are now quoted to illustrate the seasonal 
variation of the coefficient. 
