SECRETARY S REPORT. 
507 
An invitation was conveyed to our Society from tlie Leeds 
Scientific Societies to co-operate -^vitli them in arranging for a lecture 
on " The Australian Alps " by Professor Stirling, President of the 
Victorian Geological Survey. The Council thereupon resolved to 
unite with the Leeds Societies in their arrangements on equal terms. 
The lecture was given in the Leeds Philosophical Hall, on Tuesday, 
October 22nd, and was very interesting and successful. 
The Underground ^Yaters' Committee has held several meetings 
during the year, and carried on its investigations as vigorously as was 
possible. The following report was presented by Mr. A. R. Dwerry- 
house, B.Sc, F.G.S., the Secretary of theB. A. Committee, at theGlasgow 
Meeting of the British Association : — 
■■ The Committee are carrying out the investigation in conjunction 
with a committee of the Yorkshire Geological and Polytechnic Society. 
" The work of investigating the flow of underground water in 
Ingleborough, described in the report presented to the Association 
at the Bradford Meeting, was resumed by the Committee on November 
10th, 1000, when it was determined to study the underground course 
of a small stream known as Hard Gill. 
" This stream rises, on the south side of Ingleborough, in a spring 
at 1,600 feet above the sea, and flows for a distance of about half a 
mile over boulder clay. 
" It then reaches the bare limestone and commences to sink 
near the eastern corner of the croft at Crina Bottom. 
" In wet weather the stream is not ei]tirely absorbed at this point, 
but flows on past the house at Crina Bottom, and enters the rock at 
Rowan Tree Hole (Rantree Hole on (> inch map). 
At the time of the experiments the water of Hard Gill was 
entirely absorbed between the point where the 1,200 feet contour 
crosses the stream and the eastern corner of the croft, and conse- 
quently the investigation of Rowan Tree Hole, the primary object 
of the excursion, had to be abandoned. 
" It was found, however, that the bulk of the water was absorbed 
at the point where the 1,200 feet line crosses the stream, and con- 
sequently it was determined to introduce one pound of fluorescein 
into the open joint down which the water was flowing. 
