24 
or ten chains on each side of the line ; which map should 
be made either from actual survey or from accurate town- 
ship plans. 
The Committee having maturely considered the scales at 
which the proposed section should be dra^vn, recommend — 
For the 
Scale of lengths,... 264 feet (or 4 chains) to 1 inch. 
Scale of depths, ... 40 feet to 1 inch. 
To facilitate the comparison of sinkings or borings, it is 
indispensable that shaft sections, and local vertical sections, 
should be drawn on an uniform scale. The Committee, 
therefore, hope that those members who may think proper 
to forward such sections to the Society's Museum, will on 
all occasions prepare them 07i a scale of S feet to 1 inch. 
In a work so extensive as the intended section across the 
Yorkshire Coal Field, (comprising, as it does, about 25 
miles of country, and from 3,000 to 4,000 feet of strata,) it 
is obvious that the combined talent and exertion of all the 
geologists in the Society will be required to accomplish it ? 
and, although the Committee have not yet been favoured 
with many names of members willing and able to engage in 
the undertaking ; yet they have the satisfaction to announce 
that the following gentlemen have volunteered their services 
to assist in the execution of various portions of the line : — 
In the towTiships of NorthowTam and Hipperholm, Mr. 
Martin has offered his aid ; in Clifton and Hartshead, Mr. 
Holt ; in Mirfield, Mr. Bull ; in Thornhill and Shitlington, 
Mr. Briggs ; in Bretton, Crigglestone, and Woolley, Mr. 
Morton and Mr. Embleton ; in Notton, Roystone, and Shaf- 
ton, Mr. Hall ; in Brierley and Great Houghton, Mr. Har- 
top ; and in Clayton and South Elmsall, (where the line en- 
ters the magnesian limestone,) Mr. Thorp. 
The Committee, in conclusion, earnestly call the special 
attention of the Society to this object, and invite all those 
gentlemen who may be desirous of entering into it, to for- 
ward their names to the Secretary, without delay. 
