ce 
. a 
172 ~=SsT. E. Clark on Fichtelite from North Bavaria. 
Hartite. Tekoretin. 
Carbon, 8747 87:19 
Hydrogen, 1204 «& 12°81 
Now if we overlook the fact that in the analysis of hartite 
the atomic weight of carbon was taken as 6, but in the analysis 
of tekoretin as 6° 125, then Schrotter’s ‘remark seems to be cor- 
The actual difference in composition will be seen if we in 
both cases take the atomic weight of carbon as 6. 
Hartite. Tekoretin. 
87°47 5 
12°04 1281 
Asap Gerhardt* commits the same error, but in a different 
way. On noticing scheererite (kinlite) he gives the composition 
in one hundred parts as obtained by Krauss, who took the atomic 
weight of carbon as 6°125, but affixes to this a formula in whie 
it is taken as 6: e.g. 
Carbon, 92°45 02.8 
Hydrogen, 742 coins 
a hylloretin, and other resins are noticed in t the 
sam way by erhardt. Léwig in his “ Organic Chemistry” has 
sang similar errors. The same oversight is also common in 
works on mineralogy. 
Let us now compare the result which we have obtained with 
the composition of several similar fossil resins. Those ma 
which were made when the atomic weight of carbon was h ld 
to be 6125 we have recalculated. The four substances which 
bear perhaps the nearest relation to that which we have analyzed, 
are Fichtclite, hartite, te pores and phylloretin. Their compo — 
sition in one hundred parts | : 
Fichtelite. Hartite. Tekoretin. Phylioretin. 
c 87-95 87-47 = _ 8888 
a | 10°70 12-04 9°22 
They require probably the ae Ponoka Fichtelite 
CsHa, hartite CeoHs, tekoretin CH, phylloretin C Ha. | ‘ 
the numbers obtained from the analysis of Fichtelite by B * 
indicate a different formula, yet we are disposed to. OS 4 
identical with the substance which we have analyzed ; for th 
th ase under the same circumstances and in the same ic i ba 
moreover they have a common melting Ae nt. 
telite sie distills without being write and behaves re 
cohol and ether as does this re 
The oe ce in composition, iloated by the analyses, May 
ats accounted for by the fact that Bromeis ana zed 
ichtelite just as it was obtained from the wood, without 1 
* Traité de Chemie Organique, Tome quatriéme, p. 398. 
