312 



EEPOET — 1891. 



6. Does the water level vary at different 



seasons of the year, and to what 

 extent? Has it diminished during 

 the last ten years ? 



7. Is the ordinary rvater level ever 



affected by local rains, and, if so, 

 in how short a time ? And how 

 does it stand in regard to the level 

 of the water in the neighbouring 

 streams, or sea 1 



8. Analysis of the water, if any. Does 



the water possess any marked 

 peculiarity ? 



9. Section with nature of the rock passed 



through, including cover of Drift, 

 if any, with thichness. 

 9a. In which of the above rocks were 

 springs of water intercepted ? 



10. Does the cover of Drift over the 



rock contain surface sjirings ? 



11. If so, are these land springs kept 



entirely out of the well ? 



12. Are any laxge faults known to exi^t 



close to the well ? 



13. Were any brine spriitffs passed 



through in making the well ? 

 14:. Are there any salt springs in the 

 neighbourliood ? 



15. Have any wells or borings been dis- 



continued in your neighbourhood 

 in consequence of the water being 

 more or less brackish.'' If so, 

 please give section in reply to 

 query No. 9. 



16, Kindly give any further information 



you can. 



Bepori of the Committee, consisting of Messrs. H. Bauerman, F. W. 

 EuDLEK, and J, J. H. Teall and Dr. Johnston-Lavis, appointed 

 for the investigation of the Volcanic Phenomena of Vesuvius 

 and its Neighbourhood. [Draivn up by Dr. Johnston-Layis.) 



[Plate I.] 



The reporter has, during the last year, carefully and continuously 

 investigated all new sections of the rocks of the Neapolitan area. The 

 gi'eat main sewer which is in course of construction, as mentioned in the 

 last report, crosses the whole of the volcaTiic district to the west of 

 Naples and terminates near the Monte di Cuma in the Gulf of Gaeta. 

 This tunnel, of considerable section, is about 20 kilometres in length, 

 and is being constructed from nineteen points of attack. In many places 

 the materials traversed are of a very friable nature, and consequently the 

 masonry lining progresses with the cutting. It will be therefore seen 

 that most careful and constant attention and frequent visits are necessary 

 for keeping a record of the geology. Most of this tunnel is through 

 rocks at a high temperature, so that numerous thermometric observations 

 were made. So far most of the different portions are not yet joined, and 

 therefore any description would be very incomplete if given in this 

 report ; it is therefore proposed to postpone it till the next meeting of 

 the British Association. Sevei'al observations, however, of considerable 

 importance as bearing on this district as well as on vulcanological 

 phenomena in general, have come to light. 



For upwards of a year the remaining portion of the reporter's spare 

 time has been spent in the compilation of the bibliography of Vesuvius 

 and the Phlegroean fields, as well as of the other volcanoes of Southern 

 Italy. In this he has had the able co-operation of his wife, Madame 

 Antonia Lavis. This long, tedious, but very necessary work is now 

 complete, and the reporter hopes to present a copy to the Association. 

 To show the amount of toil necessary, it may be mentioned that the 

 number of entries have been more than double those published in the 

 Report of the International Geological Congress of 1881. 



