DOC.
37
213
The
fourth section contains,
further,
Planck's determination
of
the
elementary
quanta,
as
well
as
discussions
of works of
various authors
on
radiation
theory.
[12]
The
last section of the
book (pp.
180-222), which
deals with irrever-
sible radiation
processes,
offers
deep
insight
into the
nature of
the
irreversibility
of
thermal
processes.