EEPOET 01^ YAEIOrS MANrRES AT CHISWICK. 
57 
benefited, but neither were good. In iii. (LoUum) a medium 
condition of root and herbage was noted. In iv. the results were 
untrustworthy. In v. (Poa trivialis) the roots were moderately, 
the herbage well developed. In vi. {Bromus) herbage and roots 
alike well developed. In vii. (T. pmtense) neither root nor her- 
bage was benefited. In viii. {Lotus) root and herbage were both 
moderately well developed. In ix. {T. repens) and x. {Flantago) 
both root and plant were much and equally benefited. In xi. 
(Achillea) the root was apparently much advantaged ; but the fo- 
liage did not derive corresponding gain. In xii. (Carwn) root 
and leaf both derived benefit from the manure. 
6. Mineral and Nitrate. 
Eemarkable fluctuations were observable in the plants treated 
with this mixture. 
In i. {Dactylis) root and plant alike exhibited a moderate degree 
of vigour. In ii. {Antlioxantlium) and iii. (Zoliicm) a similar re- 
mark holds good. In iv. the record is untrustworthy. In v. (Foa 
trivialis) the root was less well developed than the herbage, which 
was at the maximum. In vi. (Bromus) the root was moderately 
well developed, while the herbage was at a maximum. The same 
remark is true of vii. (T. pi^atense) : but in viii. (Lotus) there was a 
great diff'erence ; the root was well developed, the foliage compara- 
tively badly. In ix. (T. repens) root and herbage were alike well 
developed, as also in x. {Flantago). In xi. (AcJiiUea) a contrast was 
observable; the roots were favoured, the herb was poorly developed. 
In xii. {Carum) the roots were moderately developed, the herb was 
at the maximum. On the whole, it would rather seem that the 
mineral and nitrate favoured the herbage rather than the root, 
and this alike in the fibrous-rooted and succulent-rooted species. 
Conclusion. 
In the preceding sections inferences and general conclusions 
from the facts observed have been given when there seemed occa- 
sion to do so. It remains now to advert to one of the main ob- 
jects of the experiment, the investigation of the causes in virtue 
of which certain plants dominate over others placed under like 
circumstances. And witli reference to this point, after an exa- 
mination of the plants during growth, and subsequently after re- 
moval from the boxes, the conclusion is forced upon the writer 
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