AGGREGATE RESULTS. 15 
6 and 7 they formed a much smaller proportion. As will be seen 
from the detailed results (Table IV.), although Area 8 agreed with 
Areas 1-4 in the proportion of these plants, it differed markedly 
from them in other respects. It would appear therefore that the 
cause of the low figures for Areas 6 and 7 is, that the heath-plants 
proper had been very largely eradicated, and that for some reason 
they had not been fully replaced by others. 
The relatively high results for Area 3 may be connected with 
the fact that the area was under a cleaning crop while under 
cultivation, and that therefore these plants had not to compete 
to the same extent with other indigenous plants. On the 
whole, these plants seem to show some tendency to decrease on 
Area 2, but on Area 4 at 134 years their total P.c. fr. was higher 
than on Area 2 at 94 years and at 104 years. 
INDIVIDUAL SPECIES. 
GRAMINEAE. 
Results for Gramineae were obtained by the Percentage 
Frequency method only. These results and also the weight of 
seed sown per acre are given in Table IV., p. 16a. 
Lolium italicum. 
This grass is usually regarded as either an annual or a 
biennial, so that, although the seed was included in the seeds- 
mixtures for most of the present areas, since none of them was 
examined within the first three years it is not surprising that the 
grass should not have been recorded. 
Lolium perenne. 
Results obtained by Armstrong in the Market Harborough 
district of Leicestershire and Northamptonshire (1) show that 
this grass may contribute largely to the herbage of some pastures. 
On different types of pastures, his results were as follows :— 
On an extreme type of poor pasture, 1 per cent. 
On other inferior old pastures, 14-1 to 44-6 per cent. 
On excellent recent pastures, 28 to 47:2 per cent. 
On first rate old pastures, 33-4 to 39-3 per cent. 
