16 PASTURE STUDIES: SOME RESULTS. 
The highest percentage frequency result obtained by the 
present writer was 20-2 on a good old pasture at an altitude of 
yo feet,* and the P.c. fr. of the grass on the best pasture examined 
by him was 4-6.? 
The present areas are not comparable with any of these. 
Armstrong’s results were obtained by a different method, while 
the conditions of soil and altitude were much more favourable on 
the other two areas mentioned than on those for which the results 
are here given. 
The grass was sown on all the present areas, with the possible 
exception of Area 8, in quantities ranging from 6 to 18 lb. per 
acre.3 Since the grass has been sown on that part of the farm 
which is under regular rotation for many years (Table I.) it is not 
known whether it is truly indigenous to Areas 1-5 or not, but, as 
shown by the results for Area 8, it is not indigenous to Areas 6, 
7 and 8. 
The highest P.c. fr. for Arcas 1-4 was 10-3 on Area 1 at 44 
years. On this area it decreased to 6-1 per cent. at 54 years, and 
at that time it was slightly less abundant than on Area 2 at the 
corresponding period, although a heavier seeding had been given 
to the former area. 
On Area 2 its decrease was slower from 54 years onwards than 
on Area 1 at an earlier date, but it was continuous and regular, so 
that at ro} years it had a P.c. fr. of only 3-0. It was rather more 
abundant on Area 3 at 8} years than on Area 2 at the correspond- 
ing period, but the results for the two areas at g years are almost 
identical in spite of the difference in quantity of seed sown, while 
on Area 4 at 134 years there was still a P.c. fr. of 1-1. 
These results indicate quite clearly that under the conditions 
of these areas the grass decreases from year to year, at least up to 
about 134 years, but that even in that length of time it does not 
completely disappear, and that, in fact, up to about 83 years it 
may be quite as abundant as in some excellent Welsh pastures 
(see above). 
1College Farm, Aber, Bangor. 
218 years old pasture in Anglesey at 200 feet, 
3 Probably more cn Area 4. 
