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the language he talks and should feel each
other to be brethren.
In particular, one thing which commonly
unites them is their common skill unpossessed
by outsiders in the use of certain instruments
& their common skills in doing performing certain work kinds
of work.
The men of that group have dealings with the men of another
group who are whose studies are more abstract,
to whom they go for information about
principles that the men of the second
group understand better, but which the
men of the first group need to apply. At
the same time the men of this first group
will probably have far more skill in their
special applications of these principles
than have the members of the second group
who understand better the principles them
selves. Thus the astronomer resorts to the
student of optics, who understands the