148 
EOYAL HORTICULTUEAL SOCIETY. 
nitrate of soda, manifested the feeblest degree of development 
throughout. 
Mineral manures were more efficacious in securing develop- 
ment than either of the two just mentioned, or than the ammonia 
salts. 
The two mixed manures 5 and 6 secured, on the whole, the best 
development. 
Mowers were shown early in all the boxes, having, probably, 
been formed the previous season. In box 5 the flowers were 
more numerous than in the rest, but, perhaps in consequence 
of the drought, almost all the flowers fell off before the seed 
was fully ripe. 
The roots in the unraanured box were the least developed 
when examined in April ; those in box 2 (mineral manures) were 
scarcely more developed. 
In box 3, however (ammonia salts), the roots attained a maximum 
of development. 
In the nitrate-of-soda box they were nearly equally luxuriant, 
but less so in boxes 5 and 6. 
Looking now to the results of this season's growth as contrasted 
with that of the preceding year, we find the plants in the unmanured 
box to have been about in the same relative condition each year. 
In box 2 (mineral manure) considerable deviation was observa- 
ble, the growth this year being much more developed and more 
subject to fluctuation. 
Box 3 (ammonia) presented, on the whole, about the same condi- 
tion ; but the plants in it attained a higher degree of development 
at the end of the season this year than they did in the foregoing one. 
In box 4 (nitrate) the plants this year, except at the end, pre- 
sented a much lower general average of growth than before. 
In boxes 5 and 6 the differences between this season and the 
last were not so strongly marked, though there was more fluc- 
tuation this year than before. 
Some of the differences observed were no doubt attributable 
to the plants having produced flowers this season, which they did 
not do in the preceding year. 
The comparative root-growth differed this year from that of 
last mainly in the circumstance that it was this year greatest 
