INDIVIDUAL SPECIES. 45 
Ranunculus repens. 
Stapledon found this plant to be one of the most important 
arable land weeds (17), and Brenchley classifies it amongst 
“arable or grass land plants ” (3). 
It was not recorded on Area 8 (old grass-heath), but it was 
recorded on all the other areas by both methods of examination. 
On Areas 6 and 7 it was, however, much less important than on 
most of the other areas. 
The P.c. fr. results for Areas 1-4 on the whole indicate that 
itis most prevalent in the young pasture under the prevailing 
conditions, and that it decreases with the increasing age of the 
pasture. The results for Area 3, however, are very high as com- 
pared with those for Area 2 at corresponding periods. 
This greater development of the plant on Area 3 is also 
apparently indicated by the Sp. fr. results, as on this area the 
plant had a Sp. fr. of 78 at 74 years, as compared with a Sp. fr. of 
62 on Area 2 at 84 years. The latter result may be slightly 
abnormal however, as on the same area there was a Sp. fr. of 70 at 
rod years. 
The Sp. fr. results for Areas 1-5 as a whole seem to indicate 
that the plant increases up to 44 or 54 years, and then decreases 
fairly rapidly. The very low Sp. fr. on Area 4 may be due to 
competition with other plants, especially vantago lanceolata, 
which had a very high Sp. fr. on this area. If anything, these 
results tend to show that a thorough cleaning of the land is 
favourable to the development of the plant, but there is little to 
show to what extent it is affected by the composition of the seeds- 
mixture used. 
Bellis perennis. 
This plant may also occur in considerable quantity as an 
arable land weed (17). 
It was not recorded on Area 8, and its development on 
\The seeds of the remaining plants are never intentionally included in 
seeds-mixtures, but those of some of them are frequently found in other seed 
sdtaples (8), (2), (44). 
