The amount of the oil obtained in ten days, i.e., from 10 charges or 1,200 kilogrammes of the wood, in summer is about 18 liters, while in winter it amounts only to 5-7 liters.  The price of the solid camphor is at present about 1s. 1d. per kilo.

The oil contains a considerable amount of camphor in solution, which is separated by a simple distillation and cooling.  By this means about 20 per cent. of the camphor can be obtained from the oil.  The author subjected the original oil to fractioned distillation, and examined different fractions separately.  That part of the oil which distilled between 180 deg.-185 deg.  O. was analyzed after repeated distillations.  The following is the result: 

Found.  Calculated as
C_{10}H_{16}O.

C = 78.87 78.95
H = 10.73 10.52
O = 10.40 (by difference) 10.52

The composition 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.)