CORRESPONDING SOCIETIES. 53 



3. Underground Waters. — -The work of this Committee had also been . 

 several times brought before the Delegates, and the Secretary, Mr. De 

 Ranee, was present to give any further explanations. 



4. Exploration of Oldburj/ Hill. — The exploration of this ancient 

 earthwork, near Ightham, in Kent, had been recommended, with the 

 special object of examining the supposed ' rock-shelters.' A committee 

 had been formed for the purpose of carrying on excavations. 



5. Geological Photography. — This Committee, of which Mr. Jeffs was 

 secretary, and the work of which had been discussed at the last meeting, 

 had been recommended for reappointment with the addition of two 

 •names. 



6. Northamptonshire Lias. — A committee for collecting and registering 

 the fossils of this formation had been recommended for appointment, and 

 excavations had already been commenced. 



7. Sea-coast Erosion. — This Committee, the objects of which had been 

 ■explained to the Delegates on former occasions, and of which Mr. Topley 

 was Secretary, had been recommended for reappointment. 



8. Registration of Type Specimens. — A recommendation had also been 

 sent in for the appointment of a committee for reporting on type speci- 

 mens in museums, an important subject, in which great assistance might 

 be rendered by the local Societies. 



9. Earth -Tremors. — This Committee, which had been referred to at 

 former Conferences, had been recommended for reappointment, with 

 Mr. Davison as Secretary. Professor Lebour explained that his occupa- 

 tions left him no leisure for acting any longer as Secretary to this Com- 

 mittee. 



10. Exploration of Elbolton Gave. — A committee had been formed for 

 the excavation of this cave, which was near Skipton, and in which relics 

 of human occupation had already been found. Some of the local Societies 

 in Yorkshire might assist in the investigation. 



11. Source of the River Aire. — The object of the Committee appointed 

 for the purpose of investigating this subject was to ascertain, if possible, 

 by means of the coal-tar colouring matter, fluorescein, whether the water 

 which flows out of Mai ham Tarn and disappears down a ' water sink ' to 

 the south of the Tarn is the stream which emerges at Malham Cove or 

 Aire Head, or at both these places. The use of the dye for this purpose 

 had been suggested by Professor Meldola to Professor S. P. Thompson, 

 and the latter had brought the subject before Section C in the form of a 

 paper with the object of having a committee appointed for the purpose of 

 carrying out the experiments. It had been suggested that the method 

 might be found generally useful for investigating the course of under- 

 ground waters, as a very small trace of the dye produced an intense 

 green fluorescence, and had not the slightest injurious effect upon the 

 water. 



Mr. C. B. De Ranee, who had also been requested to act as a represen- 

 tative of Section C, made some remarks with respect to the work of the 

 Underground Water Committee. The latter had been appointed in 1874 

 and had just presented their sixteenth report. The objects of the Com- 

 mittee were to inquire into the subject of underground water with a view 

 to supply from wells or springs. A form of inquiry had been prepared 

 in which questions were asked respecting the quality, quantity, and level 

 of the water. They were particularly anxious to secure records of the 

 water level extending over long periods of time ; they had reason 



