mately the same thing
as ozokerite.

This, however, is not sufficient to establish the pyrogenic origin of
all crystallized paraffine, as crystals can be obtained from the
amorphous residues by distillation at normal or reduced pressure or in
a current of steam. To explain these facts two assumptions are
possible. Either the chemical and physical properties of all or some
of the solid constituents are changed by the distillation, and the
paraffine is changed from the amorphous into the crystalline variety,
or the change produced by the distillation takes place in the medium
(i.e., the mother liquid) in which the paraffine exists. The change
effected in ozokerite and in petroleum residues when crystalline
paraffine is obtained by distillation is to be regarded as a
purification, and can be effected partially by treatment with amyl
alcohol. In the same way, by repeated treatment of petroleum residuum
with amyl alcohol, a substance of melting point 59 deg. C. can be
obtained, which cannot be distinguished from ordinary paraffine.

The treatment with amyl alcohol has therefore accomplished the same
results as was obtained by distillation, and the action is probably
the same, i.e., a partial separation of colloid substance. These
facts point to the conclusion that crystallizable paraffine exists
ready formed in both petroleum and in ozokerite, but in both cases
other colloidal substances prevent its crystallization. By
distillation, these colloids appear to be destroyed or changed so as
to allow the paraffine to crystallize.

It is a generally known fact that liquids always appear among the
products of the distillation of paraffine, no matter in what way the
distillation be conducted. This shows that some paraffine is
decomposed in the operation.

The name _proto-paraffine_ has been given to ozokerite and to the
paraffine of petroleum in contradistinction to _pyro-paraffine_, the
name that has been applied to the paraffine obtained by distillation
from any source.

According to Reichenbach, paraffine may crystallize in three forms:
needles, angular grains, and leaflets having the luster of
mother-of-pearl. Hofstadter, in an article on the identity of
paraffine from different sources, confirmed this statement, and added
further that at first needles, then the angular forms, and then the
leaflets are formed. Fritsche found, by means of the microscope, in
the ethereal solution of ozokerite, very fine and thin crystal
le