~ INDIVIDUAL SPECIES. 37 
Tn an experiment on the College Farm, Bangor, the follow- 
ing results were obtained :— 
Variety of seed: Dutch Dutch Wild None 
Ib. of seed per acre : 2 I I — 
Sp. fr. at 14 years: gI 98 99 85 
Sp. fr. at 2 years: 97 100 100 86 
These results are inconclusive as between the two varieties, 
but they show clearly that even without seeding the plant may be 
well distributed in a young pasture. 
The Specific Frequency method is generally unsatisfactory as 
a means of comparing the development of this plant, as even 
where not strongly represented it may give the maximum Sp. fr. 
This is clearly shown by the results for Area 2, where the plant 
had a Sp. fr. of roo and a P.c. fr. of 12-4 at 54 years, anda Sp. fr. 
of 98 anda P.c. fr. of 18-2 at 84 years. For this reason, the 
P.c. fr. results chiefly will be made use of. 
‘“ White or Dutch” seed was sown on Areas 1, 2, 3, 6 and 7, 
but not on the other areas. That the prevalence of the plant in 
the ensuing pasture at 54 years does not depend on the amount 
of this seed sown is clearly shown by the results for Areas 1 and 2. 
At this date the plant had a P.c. fr. of 31-8 on Area 1, where only 
$b. per acre had been sown, while it had only a Pvc. fr. of 12-4 
on Area 2 from 2lb. seed per acre. Since the soil, altitude, and 
grazing-are similar on the two areas the cause of this difference 
must be soughtelsewhere. It may partly be due to the difference 
in the other components of the seeds-mixtures, but this does not 
seem probable. It may also be due to the high development of 
Cynosurus cristatus and Anthoxanthum odoratum on Area 2. 
The most probable cause, however, is the difference in treatment 
—partly the treatment while under cultivation, and partly the 
subsequent treatment, and especially that Area 2 was given a 
dressing of farmyard manure after one hay crop had been taken, 
while Area 2 was not manured until the winter following this 
examination. 
1Jtis believed also that the phosphatic manure applied to Area 1 when 
sown down to grass was Basic Slag, while Superphosphate was used for Area 2. 
