46 PASTURE STUDIES: SOME RESULTS. 
Areas 6 and 7 was relatively very small, as on these areas its 
highest Sp. fr. was 18 on Area 6 at 54 years. 
It was, however, very widely distributed on the other areas, 
and gave considerably higher P.c. fr. results than Ranunculus 
repens. 
The results for Areas 1, 2, 4 and 5 are, on the whole, fairly 
regular, and from these it would appear that the plant increases 
up to 54 years or perhaps even somewhat later, but then decreases 
fairly rapidly. The results for Area 3 are different, and they show 
that the plant may have a Sp. fr. very little short of the maximum 
even at 74 years, and a very high P.c. fr. at 9} years. It is 
difficult to find any cause for this difference except that Arca 3 
had been more thoroughly cleaned than the other areas while 
under cultivation. 
Prunella vulgaris. 
This is regarded by Brenchley as a grass land plant (3), but 
Stapledon found it to occur frequently as an arable land weed, 
and especially in pastures less than a year old (17). Its seed is 
fairly frequently found in other seed samples, especially in those 
of Zrifolkum hybridum aud T. repens (8), (11), (14). 
Tt had a Sp. fr. of 7 even on Area 8 (grass-heath), but on 
Area 6, at 54 years, it had a Sp. fr. of 54, while on Area 7 (which 
has been found to be approaching the grass-heath condition at a 
more rapid rate than Area 6 in other respects) it had only a Sp. fr. 
of 22 at 44 years. 
On Areas 1, 2, 4 and 5 the results are again fairly regular, 
showing a maximum development at about 54 years. The Sp. fr. 
results for Area 3 agree fairly well with the others, but the P.c, fr. 
results for this area and for Area 4 are altnormally high.? 
Cerastium vulgatum. 
This plant was recorded in all examinations except on 
Area 8, but its development was small on other areas. On Areas 
1 These areas were all examined, August - September in each year, and at 
this time there are usually a fairly large number of seedlings of this plant. The 
Pre, fr. results, therefore, depend very largely on the number of seedlings 
produced, 
