409 
electrical action must necessarily ensue where wire ropes pass 
rapidly over metal puUies. 
The Chairman thought there was considerable weight in 
the observations made by Dr. Holland, and he hoped that 
those members of the Society who felt interested in the 
subject, would think it worth while to direct their attention 
to it. 
At the close of the preceding discussion, the Chairman 
called upon Mr. Lee, who came forward, and read the fol- 
lowing paper : — 
FOSSIL FOOT-PRINTS OF THE CARBONIFEROUS SYSTEM. 
BY MR. WILLIAM LEE, SURVEYOR OF HIGHWAYS, SHEF- 
FIELD. 
I appear before the Society to some disadvantage, because 
that part of this day's entertainment which I have the honour 
to furnish, has already formed a portion of a paper read 
before the Sheffield Literary and Philosophical Society, and 
is, therefore, strictly speaking, not new. 
I have only yielded, to the solicitation of your secretary, 
on the assurance that, to a majority of this meeting, the 
information will be original, and not uninteresting. 
My communication possesses one merit, — it will not be a 
very long one ; and as I have no doubt that the subsequent 
discussion will be the more interesting part of the subject, I 
shall proceed without further preface. 
I need not remind you that within the last fourteen years, 
foot-prints of animals upon sandstone have been found near 
Dumfries ; at Hessberg, in Saxony ; at various places in the 
counties of Lancashire, Cheshire, Salop, and Warwick ; 
and also in the valley of the Connecticut, U.S. They have 
