Notices of Memoirs — R. J. J. Lewis, Map of Vesuvius, 8fc. 27 



entitled " Carte mineralogique ou Ton voit la nature des terrains du 

 Canada et de la Louisiane." 



A geological map of a part of Massachusetts on Connecticut River, 

 by E. Hitchcock (1817), is next in point of date; after which the 

 number rapidly increases, so that no less than 924 maps are 

 enumerated in this Catalogue, which includes all maps published to 

 the end of 1881. 



In an introduction the authors give some account of the history of 

 geological maps, and state that " The first geological map is due to 

 the Abbe L. Coulon, Paris, 1664:. It appeared in a little volume 

 entitled, " Les Eivieres de France," a very rare work, of which but 

 very few copies exist in the libraries of Paris." 



II. — Notice of a Geological Map of Monte Somma and Vesuvius.^ 

 By H. J. Johnstox-Lavis, F.G.S. 



VESUVIUS, using this term for the whole volcanic pile, is of all 

 known volcanoes that one which has been most studied and 

 written about, its phenomena more investigated than any of its 

 rivals, and although its early history is not so complete as that of its 

 fellows, Etna and Stromboli, yet its eruptions during the Christian 

 Era are so intimately connected with the ill-fated cities of Pompeii, 

 etc., and thus with archaeology, that this alone is sufficient to make 

 it most prominent. 



But beyond this, its geological structure is so varied, its products 

 so numerous, its past and present historic activity permitting the 

 comparative study of these to be carried on, together with its con- 

 venient size and accessibility, led the author some years since to 

 conceive tlie idea of minutely investigating its phenomena and 

 structure, which it is his intention to publish in the form of a 

 monograph and a geological map. 



The two out of six sheets forming the splendid map constructed 

 in 1876 by the students of the Italian School of Military Topo- 

 graphy, on the large scale of 1 : 10,000 have been coloured in seven 

 different tints, indicating the various products of different eruptive 

 periods,^ with indications of dykes, of lateral craterets, of springs 

 simple, or thermo-mineral, blowing caverns, buried antiquities (of 

 geological interest), etc. The work has now extended over four 

 summers, and the examination of about half, including the most 

 complicated part of the mountain, has been completed, and the 

 author hopes that if he is able to continue the work during the 

 present and next summer, to finish it by the autumn of 1885. This 

 long time occupied in the work is dependent on various causes. 

 1st. The great intricacy of the geology. 2nd. The thick vegetation 

 requiring very numerous traverses. 3rd. The author, for pro- 

 fessional reasons, being only able to devote the snmmer months to 

 the work ; the hot Neapolitan sun of this season is so exhausting 

 that not more than four field days a week are possible, and even tlien 

 at a considerable sacrifice of health. In the two sheets exhibited 



^ Brit. Assoc. Reports (Sec. C. Geology), Montreal, 1884. 



- See Memoir by the author ia Quart. Journ. Geol. Sue. January, 1884. 



