1 66 Brenchley . — The Weeds of Arable Land . ///, 
3. On the whole the Norfolk and Bedfordshire weed floras compare 
more closely with one another than with that of the West Country, a fact 
attributed partly to geographical proximity and partly to closer approxima- 
tion in the nature of the soil in the Eastern Counties. 
4. A closer relationship evidently exists between the weeds and the 
crop than has hitherto been recognized. This is probably largely due 
to the particular conditions of cultivation of the various crops and to their 
place in the rotations practised. 
5. It is possible that a very few species will prove to have a preference 
for growing with wheat, while yet a few others are very rare with that crop. 
This suggestion, however, is very tentative as yet. 
6. The different orders of flowering plants contribute to the weed flora 
in varying proportions, some of the larger orders being represented by very 
few species, while others are most generous in the contribution they make. 
7. When several members of a genus occur as weeds, it frequently 
happens that each is a denizen of one particular type of soil characteristic to 
itself. 
8. In one district a curious mingling of ‘ acid ’ and * chalk ’ plants was 
found, possibly owing to the superposition of a thin layer of a non-calcareous 
sand on a chalk subsoil, the difference in the root systems of the plants 
enabling each to tap the particular soil most suited to its needs. 
In conclusion, I wish to express my indebtedness to Professor T. B. 
Wood and to Sir Eustace Gurney for the many introductions which alone 
made the work possible in Norfolk, and also to Mr. W. A. Nicholson, who 
identified many of the doubtful specimens which came to hand. It is not 
possible to acknowledge by name all those who have aided me by hospitality 
and advice during the progress of the research, but to all such I desire to 
tender my grateful thanks. 
October 25 , 1912 . 
