38 



entirely on the Oxford Clay. There are two isolated patches of 

 other formations in it, but both of very trifling extent, one of 

 Cornbrash, the other of sands belonging to the Calcareous Grit. 

 Comparing the plants found here with those of the comity 

 generally, I obtain the following results : — Of the 289 plants 

 described as " generally distributed," the following, so far as I 

 know at present, are wanting : — 



Fumaria officinalis. 

 Helianthemum vulgare. 

 Scleranthus annuus. 

 Geranium rotundifolium. 

 5 Prunus domestica. 

 Poterium Sanguisorba. 

 Epilobium palustre. 

 Callitriche stagnalis ( plat ij car pa). 

 , , hamulata. 



10 Petroselinimi segetimi. 

 Pastinaca sativa. 

 Centaurea Scabiosa. 



,, Cyanus. 



Matricaria Chamomilla, 

 15 Filago Germanica. 

 Senecio Jacobaea. 

 Leontodon hirtus. 

 Campanula rotundifolia. 

 Atriplex Smithii. 

 20 Eumex nemorosus v. viridis. 

 , , Hy drolap atliiim . 

 Polygonum amphibium. 

 Scirpus palustris. 

 Eriophorum angustifolium. 

 25 Carex vulgaris. 

 ,, paludosa. 

 Holcus mollis. 

 Poa nemoralis. 

 ,, compressa. 

 30 Pestuca elatior. 

 The absence of some of these is remarkable : but in the case 



