136 
EOTAL HOBTICULTTJEAL SOCIETY. 
Mineral manures were of little benefit. 
Ammonia salts produced a vigorous medium growth. 
Nitrate of soda induced for a time the most robust growth in 
the series ; and it was noted that the plants in this box were the 
first to flower. 
Under the influence of the mineral and ammonia salts, a com- 
paratively very vigorous growth was gained ; indeed, at the time 
of cutting, the plants in this box were the most highly developed 
of the series. 
The plants in the box treated with mineral and nitrate exhi- 
bited some fluctuation in growth ; at first the degree of vigour 
was slight, but subsequently it attained to a high degree. The 
plants in the two last-mentioned boxes suffered less from drought 
than the rest, though few survived the cutting for any length of 
time ; indeed, as annual plants, having perfected their seeds, it was 
not to be expected that they would do so. 
The colour of the foliage was in general paler in boxes 1 and 2 
throughout the experiment, and brightest in box 3 (ammonia). 
Owing to the death of the plants months before the roots were 
turned out of the boxes, I am not able to add any thing as to the 
comparative root-development. Neither can any trustworthy 
comparison be made between the growth in the present season and 
that in the former one, owing to the admixture of species in the 
boxes. 
Poa trivialis. 
In the unmanured box growth was, on the whole, at least as 
good as in the box treated with mineral manures ; but in both 
the plant was throughout sickly and uneven. 
Under the influence of the ammonia salts growth was very 
uniform, but of medium development. 
Nitrate of soda produced a rather higher degree of vigour in 
the plant, equalling, or nearly so, that induced by the mineral 
and ammonia-salts combined. At the close of the experiments, 
however, and after the cutting, the plants in this box were the 
most vigorously developed. 
In the box treated with mineral manures and nitrate, the 
vigour of growth was, till the cutting, uniformly greater than in 
any of the rest. 
