EEPOilT ON TARIOrS MANUEES AT CHISWICK. 
31 
No plant of Foa pratensis was observed, the contents of the 
boxes consisting principally of Foa annua and P. trivialis. 
V. Poa trivialis (annua). 
Box 1. Minimum degree of vigour uniformly throughout the 
experiment, plants healthy, but backward. Height, June 30, 
4 inches. 
Box 2. Slightly more vigorous than 1, uniform throughout 
the experiment. Average height 5 inches at the end of June. 
Box 3. Maximum degree of vigour till the end of June, when 
it was checked. Leaves broad, bluish green. Average height, 
June 30, 7 inches. 
Box 4. Uniform medium degree of vigour throughout. Aver- 
age height, June 30, 7 inches. 
Box 5. Uniform high degree of vigour throughout. Average 
height, at the end of June, 7 inches. 
Box 6. High degree of vigour ; slightly increased towards the 
end of the experiment. Average height, at the end of June, 8 inches. 
The boxes contained a very large admixture of Poa annua ; and 
though a great deal of it was pulled up, it is probable that many 
of the observations really refer to it, and not to P. trivialis. No 
flower was observed on the latter. 
In boxes 1 and 2 no relation to temperature and rainfall was 
observed, nor in box 3, except at the end of June, when there was 
a slight arrest corresponding to the diminished amount of rain. In 
boxes 4 and 5 no relation at all was noticed, and in box 6 no re- 
lation till the end of June, when a slight advance, proportionate 
to or contemporaneous with that in the temperature, occurred. 
vi. JBromiLS mollis. 
Most forward of all the twelve. 
Box 1. Minimum degree of vigour uniformly throughout the ex- 
periment ; yellowish green at the end of June, when the average 
height was 8 inches. 
Box 2. Slight advance over no. 1, uniform throughout ; yel- 
lowish green at the end of June. Average height 9 inches. 
Box 3. Advance upon 2 ; plants bluish-green, showed the effects 
of drought early, foliage nearly dead at the end of June. 
Box 4. Uniform maximum degree of vigour throughout, plants 
showed effects of drought early. Bluish -green colour. 
Box 5. High degree of vigour. Checked at end of May, pro- 
