338 REPORT— 1901. 



it was determined to introduce one pound of Fluorescein into the open 

 ioint down which the water was flowing. 



This was done at 2 p.m. on November 11, and before 7 a.m. on the 

 12th the water of the large spring at the reservoir in the Greta Valley 

 was strongly coloured. 



After introducing the Fluorescein a general survey was made of the 

 direction of the joints in the limestone in the neighbourhood of the sink 

 and on the clints above Crina Bottom, with the following results : — 



Joint at ' sink ' N. 55° W. 



On ' clints ' near sink .... N. 55° W. 



On ' clints ' above and to the west of . . (main) N. 50° W. 



Crina Bottom (secondary) S. 25° W. 



The spring at the reservoir is thrown out close to the line of 

 junction of the Carboniferous Limestone with the underlying Silurian 

 rocks, and the line from the sink where the Fluorescein was introduced 

 to the spring runs N. 55° "W.— that is, in the direction of the master 

 joints in the limestone. 



Thus, again, it has been demonstrated that the direction of under- 

 ground flow is determined by that of the master joints in the limestone. 



After a considerable though unavoidable delay the work was resumed 

 on June 21, 1901, wlien Alum Pot, on the Ribblesdale side of Ingleboro', 

 was the scene of operations. 



The joints in the neighbourhood of Alum Pot are more complicated 

 than in the parts of the district previously investigated, there being three 

 sets of joints, all more or less irregular in places. 



Close to Alum Pot there are two sets running S. 5° W. and N. 80° E, 

 respectively. 



Thirty yards higher up Alum Pot Beck they run due N, and S. and 

 N. 80° E., the north and south joints being the stronger and more con- 

 tinuous. 



On the ' clints ' 100 yards above the Pot there are three seta of joints, 

 as follows, viz. — 



Master . . . . N. 10° E. 

 Seconda:^. . . . {N.35°E. 



One pound of Fluorescein was put into the stream flowing into Alum 

 Pot on Friday, June 21, at 7 p.m. 



There was not much water flowing at the time, and a few days after- 

 wards several important springs in the neighbourhood ran dry, including 

 that at Turn Dub, on the opposite bank of the Ribble, which is the 

 reputed outlet of the Alum Pot stream. 



The springs commenced to flow again a few days later ; but although 

 they were carefully watched, as was also the river itself, no trace of colour 

 was seen. 



It was therefore concluded that either the Fluorescein had passed 

 into one of the other river basins or had become so diluted as to be 

 invisible. 



This experiment having proved inconclusive, a further one was com- 

 menced on Thursday, September 5, the results of which are not yet 

 known. 



Owing to the long delay caused by the drought and other circum- 

 stances beyond their control, the Committee have been unable to 



