68 
EOTAL HORTICULTURAL SOCIETY. 
conditions of both luxuriance and maturation being thus supplied) 
than where they were used alone, is probably accounted for by 
the facts that where they were used alone there was, owing to 
the richness of the. soil, a sufficiency of mineral matter within 
the increased root-range for as full an amount of produce over 
the area as the limitation of season would admit of; whilst, 
where both the nitrogenous and the mineral manures were em- 
ployed, the limitation of season again prevented any increased 
effect from the increased supplies by manure. 
The dotted line, showing the percentage of mineral matter in 
the dry substance, throws some light on these points. It should 
here be premised that, other things being equal, a low percentage 
of mineral matter in dry substance is generally indicative of rela- 
tively high condition of maturation, and a high percentage of 
mineral matter of backward or low condition of maturation. 
We find, accordingly, a considerably higher percentage of mineral 
matter in the produce grown by ammonia-salts and mineral 
manure than in that by ammonia-salts alone, and, again, con- 
siderably higher in that by nitrate of soda and mineral manure 
than in that by nitrate of soda alone, indicating that the produce 
by ammonia-salts or nitrate of soda alone was relatively more 
matured, or, in other words, had less potential growth before it, 
than that where the minerals were also used. Having directed 
attention to these points in detail in this case, Ave may be more 
brief in reference to the other grasses. 
Diagram 8. Antlioxantlium odoratwn. — The continuous line 
shows meagre growth under each of the six different condi- 
tions of manuring. In all the boxes of this species the plant 
was very irregular ; and hence little satisfactory conclusion can 
be drawn in regard either to the comparative amounts of pro- 
duce, or the condition of its maturation as indicated by the 
dotted line. The root-range also being comparatively limited, 
the differences in the amounts of produce are also limited, though 
with this limited range (and consequent less influence from the 
richness of the bulk of the soil) the effects of the manures, with 
the exception of the purely mineral, are upon the whole normal 
in direction, — there being a slight increase with the ammonia- 
salts, and more with ammonia and mineral manures together — 
also more increase with the more rapidly available nitrate, and 
more still when it is used in combination with the mineral 
manure. The high percentage of mineral matter indicated in 
