14 
This is the only carbo-hydrogen fossil found in the 
coal beds of Oberhart., while at Redwitz there are at 
least two; at Utznach three have been described, in- 
eluding one derived from the distillation of Konlit; and 
from Holtegard two have been analyzed by Forch- 
hammer. 
We have thus briefly alluded to the various fossil 
resins found in the four different localities mentioned, 
because it will be necessary to speak of the relation 
which they bear to one another and to the substance 
which we have analyzed. 
As to the actual composition of several of these 
fossils much doubt, exists, for most of the analyses were 
made at a time when the atomic weight of carbon was 
considered to be 6.125, and the method of analysis was 
much less perfect than at present. 
We shall now proceed to notice more specially the 
substance which we have received for analysis; beginning 
first with it appearance in the wood, and the mode of 
extracting and crystalising it, together with its crysta- 
line form; next the action of various reagents upon it; 
then its composition and relation to other similar resins 
which have been mentioned; and finally its chlorine and 
bromine compounds. 
This substance occurs principally between the an¬ 
nual rings of the wood, which have separated or are 
still loosely joined to one another. Here it forms layers, 
often one tenth of an inch in thickness, of shining trans¬ 
parent scales, having more or less of a yellowish tinge, 
and lapping one over the other. These exhibit when 
