25 
The formula obtained for Hartit stands nearer that 
of the fossil resin which we have analyzed; its crystals 
are also monoclinic; towards alcohol, ether, and sul¬ 
phuric acid it behaves the same; and during distillation 
but a small portion is decomposed; but its melting‘point 
is much higher, 74° C., besides it occurs in another fossil 
pine, Peuce acerosa Ug., and in another geological for¬ 
mation, being as to its origin much' older. 
Tekoretin resembles this resin in every particular 
except in composition. Its melting point is 45° C ; it 
distills at nearly 336° ; possesses the same solubility in 
alcohol and ether; the effect of nitric acid and chlorine 
gas in the same, building two compounds with the latter, 
which Forchhammer did not succeed in separating; and 
it is also found in the buried stems of P. sylvestris ; but 
the formula required by its analysis obliges us for the 
present to consider it as another resin. 
Phylloretin, which like the latter is found in the pine 
stems in the marshes of Holtegard, though distilling at a 
high temperature and forming compounds with chlorine, 
differs not only in composition, but in its melting point, 
87 0 C., from the fossil resin which we have described. 
We have still another carbo-hydrogen resin to no¬ 
tice, which was the first described of all these in 1827. 
This was called Scheererit. It melts at 44° C. and distills, 
without being decomposed, at 90° C. 
Some confusion exists with regard to this fossil, from 
the fact that Kraus 1 has given the analysis of a substance 
1 Ann. d. Phys. u. Chem. Vol. XLIII, p. 141, 
