56 
EOYAL HOETICULTUEAL SOCIETY. 
{Foa annua) root medium, plant maximum. In v. {JPoa trivialis) 
root and plant both higli. In vi. (JBt^omus) root and plant both 
low. In vii. {Trifolium pratense) a great contrast was observable ; 
the ammonia seemed to have favoured the roots, but to have been 
productive of but little benefit to the herbage. In viii. {Lotus) 
root and herbage were both about medium ; and the same may be 
said in general terms as to ix. {T. repens), x. {Flantago), xi. {Achil- 
lea), and xii. {Car urn). 
4. Nitrate of Soda. 
Here also the differences were considerable. In i. {Dactylis) 
both root and plant were well developed, in ii. {Anthoxanthum) 
still better. In iii. {Lolium) a contrast was observable ; the root was 
only medium, while the plant was very good. In iv. {Poa annua) 
the roots were good. In v. {Poa trivialis) both root and plant were 
indifferent. In vi. {Broonus) the root was medium {c), the plant 
superior {f). In vii. {Trifolium pratense) both root and plant 
were low. In viii. {Lotus) a contrast was exhibited ; the root was 
highly developed {f), while the plant was medium. In ix. {T. re- 
pens) an inverse condition occurred. In x. {Plantago) root and 
herbage were alike moderately developed. In xi. {Achillea) root 
and herbage both highly developed. In xii. {Carum) root highly 
developed, top moderately so. 
On the whole, it would seem that nitrate of soda favours root- 
development rather than that of the herbage ; thus in Lotus and 
Carum the thick fleshy roots were apparently specially benefited 
by the nitrate, while the herbage was not proportionally favoured. 
In Bromus, on the other hand, where the herbage was good, the 
roots were low. Anthoxanthum at first sight seems to be an ex- 
ception, as root and herbage are alike marked as benefited by 
the nitrate ; but it must be remembered that the herbage of this 
grass was very badly developed in all the boxes (bad was the 
best). In two of the very free-growing grasses, however, the 
Lolium and the Bromus, it was the plant and not the root that 
was characteristically developed by the nitrate. 
5. Mineral and Ammonia. 
The differences in the twelve plants were considerable. 
In i. {Dactylis) root- development was not benefited, but the 
herbage was. In ii. {Anthoxanthum) both herbage and root were 
