This much is clear—
have a real understanding of botany,
and know how to name all plants
with intelligible names.
Then, be either of two things:
collectors or methodizers. The first,
concerned primarily with the number
of species of plants.
The second with the arrangement
of plants and nomenclature.
(The amateurs of botany
are those who have produced various
works about botany, though they do
not properly pertain to botanical science:
anatomists, gardeners, physicians,
and miscellaneous, within which fall
economists, biologists, theologians, poets.)
Without fail, studiously seek out
the natural method—of classification.
For this is the beginning and the end
of what is needed in botany. Remember,
nature does not make leaps. All plants exhibit
their contiguities on either side,
like territories on a geographical map.