106 
UPWARD GROWTH OF THE HEAD, AND [Part II. 
in height. In March, 1848, I placed a second 
chimney-pot on the first; and the plant grows 
and bears fruit now, 1853. 
From the results of these experiments, I think 
it probable that the organisation of the first 
gemmule of a plant is peculiar; and I have not 
a doubt that the first radicle or tap-root of the 
seedling has a different cellular structure from 
that of the branch or side-roots. If these sup¬ 
positions are facts, they are very interesting, as 
showing most clearly and beautifully the hand 
and design of the Creator. The same physical 
causes, — that is, moisture and turgescence, 
drought and exhaustion, heat, cold, light, atmo¬ 
spheric aeration, &c.,—acting on different cellular 
organisations, unerringly trace out to each part 
of the plant the course which it is ordained to 
pursue. A seed is deeply buried in the autumnal 
hoard of some animal; its first gemmule is 
endowed with an organisation which sends it 
directly upward. It no sooner reaches the 
atmosphere than its growth turns wherever it 
can find light, which is, in fact, generally wher¬ 
ever it can find room. The seed falls on the 
surface of the earth, a first root is struck out, 
whose vertical determination downward nothing 
can pervert ; though lighter and softer than the 
