Parallelism of the Paleozoic Deposits, §c. 359 
The loss of weight sustained by the contents of the erucible, 
was 11:30 grs. Considered as due entirely to the burning of the 
_arbon, this would give for the 100 grs. of graphite, carbon, 94:16 
grains. 
Twenty grains of the sublimate in coarse powder, weighed 
after strong calcination, were deposited in the trough of a bent slip 
of mica, and in this position, introduced into a tube of Bohemian 
glass, drawn to a small orifice at one end and adapted at the other 
to the pipe of the oxygen gasometer. After raising the material to 
alow red heat by a lamp applied beneath the portion next the 
gasometer, a very gentle current of oxygen was allowed to pass 
along the tube. A steady combustion without scintillation was 
thus maintained, which traveling slowly to the remote end of the 
carbonaceous matter in the mica trough, reduced the whole in a 
ew minutes to a light greyish ash. The mica was then with- 
drawn, and the ash on weighing, amounted to 0°33 grains. Tt 
showed by tests a scarcely sensible trace of iron, and consisted 
almost wholly of silica. 
Regarding the sublimate as made up of this and carbon—we 
have with 100 grs., earthy matter, 1°65 grs., and carbon, 98°45 grs, 
Comparing now the results by the new oxydating process with 
those obtained by ignition in oxygen, we have, 
. A New Process. Ignition. 
Fibrous Graphite, t 94:56 : 94:16 
Black Sublimate, : 98°29 : 98°45 
Arr. XL.—Parallelism of the Paleozoic Formations of North 
merica, with those of Europe.* 
(Continued from p. 183.) 
a 
together and showing how they correspond. But when, on the 
Contrary, two continents are separated by a vast sea, we have 
* Since the geology of the United States has attracted attention, it has been 
the endeavor to sa dn the sedimentary de a i = gp ape peg mere 
rope ; it i i ication of the Silurian System '. Mu 
Rr ianee Sane ae ea baal Salle een If the limits within which we 
are forced to restrict ourselves at this time, do not permit us e atte 
of this kind by Messrs. Conrad, Dale Owen, Rogers, Troost, Jackson, and by the 
8eologists of the state of New York, it is not because we do not acknowledge 
‘heir merit. On the contrary, no one more than ourselves, and we wish to ex- 
Press it, admires the great works published within a few years by the American 
ecologists, w : j a ¢ é rE 
ave first studied their own ground, without being predccupied with that of Europe, 
his * their works is almost always irreproachable. In regard to the rela. 
nof ms | 
pardon ~ the slight changes which the comparative study of the fossils induces 
Wo propdes, 
