Geology. 131 
fairly compare them with the graphitic coal of Rhode Island. 
These instances, however, are exceptional, and the greater part of 
d occurrence to the potenti fr matter in bituminous shales 
and limestones. We may compare the disseminated g ip es fs 
that which we find i in those hao of Canada in which Siluri 
eti of 
graphi ite m may have been formed by the segregation. 0 of bituminous 
matter into fissures and planes of least resistance, in the manner 
in which such Noman Lite in modern bituminous limestones and 
shales. Such bitu 8 occur in the Lower Carboniferous 
limestone and cele od of. Daschawer sae Hillsborough, New Bruns- 
wich, with an arrangement very similar to that of the veins of 
graphite; and in the Quebec rocks of Point Levi, veins attaining 
to a thickness of more — a foot are filled with a coaly matter 
having a transverse column Tame and a ed by Logan 
and Hunt as an sient hie These paleozoic analogies 
ero) 
changed into graphite. This woul ve a gape that 
the vegetation — was pasty = at ho gre ast that it was accu- 
mulated under wa 
“Dr. Hunt has, seo ay observed an indication of terrestrial 
vegetation, or at least subaérial oon in the great beds of Lau- 
wanes” 
He concludes as follows: 
e may sum Pay — facts and considerations in the followi 
statements —First, tha: somewhat obscure traces of organic struc. 
ture can be detected fs the Laurentian graphite; secondly, that 
the general e of the substance 
corresponds with that of the carbonaceous and bituminous mat- 
ters in marine formations of more modern date; thirdly, that if 
the Laurentian graphite has been derived from vegetable matter, 
* Granby, Melbourne, Owl’s Head, &c., ‘ Geology of Canada,’ 1863, p. 599. 
- } Geology of Canada, 1863. ue 
