Mere Gill Hole.

Mere Gill rises on the upper slopes of Ingleboro', and flows down the hollow known as Humphry Bottom, and sinks in a large open joint running N. 50 W. at Mere Gill Hole, on Mere Gill Platt.

Mere Gill was charged with fluorescein at 1 P.M. on July 4, and the colour was observed on the following morning in the spring S 111, on the left bank of Chapel Beck, immediately above Gods Bridge, and almost in the direct line of the master joint at Mere Gill Hole. From S 111 the water passed under Gods Bridge by way of P 91, and reappeared below the bridge at S 112.

The small streams sinking at P 101 and 102, on Black Shiver Moss, to the south-west of Mere Gill Hole, have not as yet been tested.

Passing along the hillside in a south-westerly direction, the next stream of importance is that at Crina Bottom, the course of which has been described in a previous report.

Long Kin West.

The group of potholes known as Long Kin West, P 108, was examined, and it was found that no water was flowing into them, nor was there any evidence that a stream had lately occupied any of them, and, consequently, no test was possible.

By visiting these pots during heavy rain, when there is a large amount of local surface drainage, we may be able to connect them with some of the neighbouring springs.

Grey Wife Sike.

On referring to the first report of the Committee, it will be found that an unsuccessful attempt was made to trace the water flowing down P 1, at the foot of Grey Wife Sike.

On that occasion methylene blue was employed, and, as that reagent has since been found to be practically useless for our purposes, we determined to try again with fluorescein.

Accordingly, about half a pound of fluorescein was introduced at P 1 on July 2, and another similar quantity on July 4. This came out at Moses Well, S 7, a large spring on the right bank of Clapham Beck, on the 5th

and 6th.

The River Greeta.

The last piece of work undertaken this year was the tracing of the underground course of the main stream in Chapel-le-Dale.

This stream flows underground in many places in normal weather, but when in flood occupies a well-worn channel on the surface.

The upper part of the stream, above Weathercote, is known as Winterscale Beck, the portion between Weathercote and Gods Bridge as Chapel Beck, and from that point down to Ingleton as the river Greeta.

The stream rises on the moors near the tunnel of the Midland Railway, above the Ribblehead Viaduct, and soon sinks in a series of potholes, there being, however, a well-marked open flood channel.

The whole stream again comes to the surface at the mouth of Gate Kirk Cave, S 107, and another large spring a few yards away.

It then flows through several large pools, and again goes underground at P 85, leaving the stream bed dry, to again emerge about seventy yards

further down at S 109. It again sinks at the foot of Haws Gill, P 87, where it is joined by the water from Eller Keld Spring.

Except in cases of exceptional flood, the bed of the stream below this point is dry, and from the point where Philpin Lane crosses the channel, to Philpin Hole, it is occupied by meadow land, which shows no sign of having been recently overflowed.

In the clough above Weathercote Cave the water can be heard below the stream bed, and actually comes to the surface in several places in wet weather. It emerges in the fine waterfall in Weathercote Cave, and again passes below the limestone at the bottom of that pot.

The water sinking in Weathercote Cave then passes through the pool at the bottom of Hurtle Pot, and finds its way beneath the surface to Gods Bridge, where it finally comes to light, and flows off the carboniferous limestone on to the Silurian rocks some 200 yards farther down stream.

In extremely wet weather Weathercote Cave fills up and overflows at the surface, washing over the carriage drive, and flows into Jingle Pot, and also down the, at other times deserted, river bed.

Hurtle Pot, when the stream is in moderate flood, makes an extremely weird noise, similar to that produced by the inrush of water and air when the plug is removed from the bottom of a lavatory basin, but immeasurably louder. This noise is caused by the suction of air through gigantic eddies produced in the deep pool at the bottom of the pot.

In extremely heavy flood Hurtle Pot fills up and overflows into the surface channel, thus acting in a manner precisely similar to Footnaw's Hole, described in the last report of the committee.

The surface channel from Chapel-le-Dale Church to Gods Bridge is usually dry, but is occupied by the stream when in flood.

The underground channel seems to follow the direction of the open one very closely, as the water can be heard at many points, and appears at the surface in wet weather.

The following is the fluorescein record from which the above has been deduced:

Two pounds of fluorescein put into the stream just below the mouth of Gate Kirk Cave, on the morning of August 23: Sank at P 85, and emerged at S 108 at 1 P.M.; sank at P 86 at 1.30 P.M.; seen at S 109 and P 87 at 2 P.M.

August 24.-Seen in Weathercote Cave at 9.15 A.M.; seen in Hurtle Pot at 10 A.M.

August 25.-Arrived at S 112 (Gods Bridge) at 12 noon.

It will be seen that the work on Ingleboro' is now almost completed. It only remains to test two streams which have hitherto proved refractory, and one or two small streams on the west side of the hill. These latter should offer little difficulty, as the main flows on both sides of them have been determined, and their possible range thus limited.

We have been unable as yet to carry out the proposed borings at Turn Dub, owing to the absence of the owner of the property in South Africa, and our consequent inability to obtain the necessary permission.

Through the courtesy of the Yorkshire Ramblers' Club several members of the joint committee were enabled to make the descent of Gaping Gill, the pothole mentioned in the first report of the Committee, and to explore the extensive system of chambers and passages at the bottom of the shaft.

The thanks of the Committee are due to the following gentlemen, who

have kindly assisted them in their work :-Professor Thompson and Mr. E. J. Edwards, of the Yorkshire College; Mr. Metcalfe, of Weathercote Mr. Sydney Calow; Mr. R. Nowell, of Ribblehead; Mr. Percy Lamb, of Clapham; Mr. Taylor, of Crummack; and Mr. Cook and Mr. Hunt, of Horton-in-Ribblesdale.

The Committee asks to be reappointed, and to be allowed to retain the unexpended balance of the grant made at the Belfast meeting.

Photographs of Geological Interest in the United Kingdom.--Fourteenth Report of the Committee, consisting of Professor JAMES GEIKIE (Chairman), Professor W. W. WATTS (Secretary), Professor T. G. BONNEY, Professor E. J. GARWOOD, Professor S. H. REYNOLDS, Dr. TEMPEST ANDERSON, Mr. GODFREY BINGLEY, Mr. H. COATES, Mr. A. K. COOMARASWAMY, Mr. C. V. CROOK, Mr. J. G. GOODCHILD, Mr. WILLIAM GRAY, Mr. ROBERT KIDSTON, Mr. J. ST. J. PHILLIPS, Mr. A. S. REID, Mr. J. J. H. TEALL, Mr. R. WELCH, and Mr. H. B. WOODWARD. (Drawn up by the Secretary.)

THE Committee have to report that during the year 463 new photographs have been received, bringing the total number in the collection to 3,771. This exceeds by 50 the largest number of new photographs previously recorded in a single year, and the yearly average now reaches 268. About 60 additional photographs have been sent in since this Report was written. The usual geographical scheme is appended. Brecknock, Cardigan, Nairn, and Ross appear for the first time, and very substantial additions are made to Cheshire, Dorset, Norfolk, Yorkshire, Glamorgan, the Channel Islands and Scilly, Inverness, Sutherland, Antrim, and Louth. The following twenty-five counties are still entirely unrepresented :-Cambridge, Huntingdon, Rutland, Carmarthen, Clackmannan, Dumbarton, Dumfries, Kincardine, Kinross, Roxborough, Selkirk, Carlow, Kildare, Kilkenny, King's Co., Leitrim, Longford, Monaghan, Queen's Co., Roscommon, Tyrone, Waterford, Westmeath, Wexford, and Wicklow.

The high standard mentioned in the last Report is maintained, the photographs being usually taken in sets and with a definite geological aim. Mr. W. Jerome Harrison sends two large series taken to illustrate glacial phenomena on the Norfolk and Holderness cliffs. Mr. Morton and Mr. Howard contribute illustrations from Brecknock; Mr. R. H. Preston from the Scilly Islands; Mr. Guiton from Jersey; and Mr. Maidwell from the Nuneaton district. Mrs. Coomaraswámy has taken several series from the north of Scotland and of Ireland; Mr. Wright a useful set from Dublin; and Mr. Lamond Howie some interesting Scottish mountain photographs. The Croydon Natural History and Scientific Society continues to illustrate the geology of Surrey; Dr. Abbott that of Durham; Mr. Hopkinson that of Bedfordshire; and Mr. Hodson that of Leicestershire.

The members of the Committee have not been idle, as is testified by Professor Reynolds' series from Dorset, Gloucestershire, Somersetshire, Glamorgan, Antrim, Down, and Kerry; Mr. Bingley's sets from Cheshire and Yorkshire; Mr. A. K. Coomaraswamy's series from Ross, Sutherland, and Berwick; Professor Garwood's contribution from Westmoreland; Mr. Teall's photographs from Hertfordshire; and Mr. A. S. Reid's continuation of his series from Eigg and Perthshire.