mposition thus nearly agrees with that of the ordinary camphor.

The fraction between 178 deg.-180 deg. C., after three distillations, gave the
following analytical result:

C = 86.95
H = 12.28
-----
99.23

It appears from this result that the body is a hydrocarbon. The vapor
density was then determined by V. Meyer's apparatus, and was found to be
5.7 (air=1). The molecular weight of the compound is therefore 5.7 x 14.42
x 2 = 164.4, which gives

H = (164.4 x 12.28)/100 = 20.18
or C_{12}H_{20}
C = (164.4 x 86.95)/100 = 11.81

Hence it is a hydrocarbon of the terpene series, having the general formula
C^{n}H^(2n-4). From the above experiments it seems to be probable that
the camphor oil is a complicated mixture, consisting of hydrocarbons of
terpene series, oxy-hydrocarbons isomeric with camphor, and other oxidized
hydrocarbons.

_Application of the Camphor Oil_.

The distinguishing property of the camphor oil, that it dissolves many
resins, and mixes with drying oils, finds its application for the
preparation of varnish. The author has succeeded in preparing various
varnishes with the camphor oil, mixed with different resins and oils.
Lampblack was also prepared by the author, by subjecting the camphor oil to
incomplete combustion. In this way from 100 c.c. of the oil, about 13
grammes of soot of a very good quality were obtained. Soot or lampblack is
a very important material in Japan for making inks, paints, etc. If the
manufacture of lampblack from the cheap camphor oil is conducted on a large
scale, it would no doubt be profitable. The following is the report on the
amount of the annual production of camphor in the province of Tosa up to
1880:

Amount of Camphor produced. Total Cost.

1877.......... 504,000 kins.... 65,520 yen.
1878.......... 519,000 " .... 72,660 "
1879.......... 292,890 " .... 74,481 "
1880.......... 192,837 " .... 58,302 "

(1 yen = 2_s_. 9_d_.)
(1 kin = 1-1/3lb.)

* * * * *

THE SUNSHINE RECORDER.

McLeod's sunshine recorder consists of a camera fixed with its axis
parallel to that of the earth, and with the lens northward. Opposite to the
lens there is placed a round-bottomed flask, silvered inside. The solar
rays reflected from this sphere pass through the lens, and act on the
sensitive surface.

[Illustration]

The construction of the instrument is illustrated by the sub