EEPORT ON TARIOUS MANURES AT CHISWICK. 
55 
rately considered. It will now be useful to compare the effects 
of each kind of manure on all the twelve plants, both in regard 
to their root and their herbage. 
1. JJnmanured. 
In almost all cases the roots in the unmanured box 1. were the 
least developed ; the exceptions were in the case of iv. {JBoa annua) 
and ix. {Trifolmm repens). The difference was slight in the latter 
case, while in the former, for reasons before cited, the record is 
not trustworthy. The condition of the plant in October and that 
of the root in April have been alluded to already ; nevertheless it is 
desirable to recall the great development of leaf as contrasted 
with that of the root in viii. {Lotus), and xi. {Achillea). 
2. Mineral Manures. 
When the twelve plants treated with mineral manures were com- 
pared with each other as to their root-development, the differences 
were seen to be very remarkable. In i. {Dactylis) root-develop- 
ment was at a maximum {f)\ in ii. {Anthoxanthum) and iii. {Lo- 
lium) it was low ; in iv. {Poa annua), v. (P. trivialis), andvi. {Bro- 
mus) high ; in y!\\.{Trifolium 'pratense) still high ; but in viii. {Lotus) 
and ix. {T. repens) it was low, as also in x. {Plantago), xi. {Aehillea), 
and in xii. {Carum). There are some very curious discrepancies 
here between the various grasses and between the various clo- 
vers — though the general result seems to be that, so far as the 
root-development is concerned, the mineral manures favour the 
more fibrous-rooted plants, and are of little or no use to the more 
fleshy tap-rooted species. 
The different effect on plant and root was also striking. Thus in 
Dactylis the top did not thrive in mineral manures ; and the same 
held true of AntJioxanthu^n, Lolium perennCy Poa trivialis, and 
JBromus. In Achillea, again, a contrast was observable ; the mi- 
neral manures favoured the plant, but did comparatively little for 
the root. 
3. Ammonia salts. 
Yery considerable variations were observable in the root-deve- 
lopment of the twelve plants treated with ammonia salts. In 
i. (^Dactylis) and ii. (Anthoxanthum) the root-development was 
good, while that of the plant was inferior. In iii. {Lolium) root- 
development was at a maximum, the plant only medium. In iy. 
YOL. III. I 
