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This

garden-annualwe

trace down

to a seed

planted in

the

spring,

and

analogy

helps us

backto the

microscopic

ovule

whence the

seed

arose.

Observation,

verifying

forecast,extends

our

knowledge

to the

flowers

and the

seeds, and

afterwards

to

thedeath

and decay

which,

sooner or

later,

ends in

diffusion,

partly

throughthe

air,

partly

through

the soil.

Here the

rise of

the

aggregate

out of

theimperceptible

and its

passage

back into

the