INDIVIDUAL SPECIES. 3r 
land under Roots, Cereals and Seeds. It is not surprising 
therefore, to find the genus strongly represented even in a young 
pasture, and although a thorough cleaning may have a consider- 
able effect for some years in some cases, the fact that the grasses 
had a higher P.c. fr. on Area 3 at 94 years than on Area 2 at the 
corresponding period suggests that after some lapse of time this 
has little effect. 
The genus was less strongly represented on Area 1 than on 
Area 2 at corresponding periods, but the difference was not very 
great. On Area 2, however, there was a considerable decrease 
from 64 to 74 years. This, although there was no apparent 
change in the season immediately following its application (64 
years), may be connected with the application of Basic Slag. 
Between 84 and 9} years there was again a large increase, and 
the P.c. fr. of these grasses was very nearly the same for Area 2 at 
g} years, Area 2 at o$ years and ro} years, and Area 4 at 134 
years, but even then the. genus was less represented than on the 
best pasture examined by the writer. 
On Areas 6-8 only Agrostis tenuis was present. It formed 
42-9 per cent. of the total herbage of the old grass-heath (Area 8), 
but it formed 58-7 per cent. of the total herbage of Area 7 even 
at 54 years, and this increased to 69-3 per cent. under heavy 
grazing at 64 years. The same influence of very heavy grazing 
was found on Area 6, where the grass increased from 8-6 per cent. 
at 64 years to 27-2 per cent. at 74 years. On this area the grass 
had an exceedingly low P.c. fr. at 44, 54 and 64 years in spite of 
the fact that the area had not been under a cleaning crop. 
Since the soil conditions and the general treatment were 
practically identical for the two areas, the difference in the 
development of Agrostis must apparently be attributed to either 
of the following two causes :— 
(a) As already stated, a crop of hay was taken from 
Area 6 at 1} years from seeding, while Area 7 was grazed 
at the corresponding period. Area 6 was, however, put at a 
disadvantage to the extent that it was not compensated for 
this extra crop taken by extra manuring, but in spite of this, 
