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imperceptible

is

indistinct

ateach

extreme.

Nevertheless

we may say

that in

the case

of this

organism,as

of

organisms

in

general,

the

account,

partially

based on

observation

butlargely

based on

inference,

fulfils

the

definition

of a

complete

historyfairly

well. But

it is

otherwise

throughout

the

inorganic

world.

Inferencehere

plays the

chief

part. Only

by the

piecing

together

of

scattered

factscan

we form

any

conception

of the