oil belongs.

_Exposure to Cold._--This oil is apparently unaffected by exposure to
a temperature of -13.3 deg. C. (8 deg. F).

_Qualitative Examination._--The action of sulphuric acid is
remarkable. When a drop comes in contact with the oil, the latter
apparently solidifies round the drop of acid, forming a black envelope
which grows in size and gradually absorbs and acts upon so much of the
surrounding oil as to assume the appearance of a large dried currant
of somewhat irregular shape.

When a drop of the oil is added to nitric acid, it solidifies, and
on heating very readily changes into an orange yellow solid, which
appears to soften, though not to liquefy, at the temperature of
boiling water. This substance is readily soluble in hot solution of
potash or soda, producing a deep brown liquid, from which it is again
deposited in flocks on acidifying. I have not yet found any solvent
for it. The action of nitric acid with linseed oil is more similar to
this than that with any other oil I have tried, but the nitro products
of the two, if I may so call them, are quite different from one
another. That from linseed oil produced as indicated remains liquid at
ordinary temperatures, as does the oil upon its addition to the acid.

_Elaidin Test._--By the action of nitric acid in presence of mercury,
a semi-solid mass is produced of a much deeper color than in the
preceding cases. A portion of the oil remains in the liquid state, as
is usually the case with drying oils.

_Free Acidity._--By the method indicated, it was found that 100
grammes of oil required 0.39 grammes caustic potash to neutralize the
acid occurring in a free state.

_Saponification of the Oil._--The oil saponifies readily on being
heated with potash in presence of alcohol, and the amount required to
convert it entirely into potash soap was 211 grammes of caustic potash
per thousand grammes of oil. There are no saponification numbers for
oils that can be considered close to this. I can find no record of
any having been obtained between 197 and 221, so that the further
examination on which I am now engaged may show this unusual number to
be due to this oil containing some new fatty acid in combination.

_The Fatty Acid._--The acids produced by adding acid to the potash
soap formed in this case a cake on cooling, of a much deeper color
than I have before obtained. After washing well they amounted to 94.10
per cent. of the oil. The amount dissolved by t