Notices of Vegetable Remains in Coal Strata. 389 
In the above figure, such a current is represented in two 
sections at right angles to the axis of the wires, when simiy 
larly electrified, from which it will be apparent that the 
north and south powers meeting, will attract each other. — 
In the following figure, the sections of the wire are shown 
oo electrified, ee which sissies magnetic powers 
t, and consequently occasion a repulsion. © 
53. Notices of Vegetable Remains in Coal Strata. 
TO THE EDITOR. | 
SIR—The very close resemblance the figures in your 
last Journal marked C 4—, bear to a remarkable 
sandstone which occurs pe oe in the coal fields of 
Scotland, a ey equainte nted with the latter. 
th of. th are vast qual 
of this Cau = imitative forms, more ‘com- 
monly rcsembiing’bi Hitches or of trees. “These are seldom 
less than an inch in diameter, and often exceed four inches. 
Branches of smaller size are sent off from the larger, and 
the exterior of all is covered with the impressions so we 
delineated in Mr. Granger’s paper. Although they have 
been examined by gers cin naturalists in Great 
1 
ef Large Organic pM 
- In some éf the sandstone rocks _ ‘which alternate with 
+ eleaery  sne ene in all the coal- 
fields of England,’ fie retaaiils of very large, thin, hollow or 
