OF A CAMBRIDGESHIRE WOODLAND. 319 
APPENDIX. А. 
Tue following diagram illustrates the intervelations of the Societies of the 
caleareous clay to the main determining conditions. The sub-societies are 
not specially named. 
Light. 
o 
| 
Spiraea Ulmaria— Deschampsia 
caespitosa Society. 
Fragaria vesca Society 
Mercurialis perennis Society. 
Spiraea Ulmaria Society. 
| | | | | 
60 50 40 30 20 — ie 
Summer water-content 
