406 DOC. 42
CORRECTION
TO DOC. 38
Published in Annalen
der
Physik
22
(1907):
800.
Received
3
March
1907, published
4
April
1907.
[1]
Einstein 1907a
(Doc. 38),
p.
187. The fre-
quencies
in
question
are
in
the
infrared
region.
The
reference is to
Drude
1904a,
especially p.
682.
[2]
Presumably
Einstein
is referring to absorp-
tion
of
waves
in the infrared
region,
specifically
wavelengths greater
than 4.8|x. See Einstein
1907a
(Doc. 38), p.
187.
[3]
That
is,
one
that shows the
temperature
de-
pendence
of
specific
heats derived in Einstein
1907a
(Doc. 38).
[4]
Einstein told Sommerfeld in
1910 about the
approximate
confirmation
of
the first
part
of
this
statement
(see
Einstein
to Arnold
Sommerfeld,
July 1910).