VULCANOLOGY AND SEISMOLOGY. 299 



tbatis, those wliich correspond to tlie numbers iii to x of the Rossi 

 Forel scale. The lists occupy about 400 octavo pages and are pre- 

 ceded by a brief separate notice of the more important shocks. 



Prof J P. O'Reilly, of Dublin, has followed his catalogue of British ■ 

 earthquakes (1884) by a similar catalogue of - Earthquakes recorded a^ 

 having occurred in Europe and adjacent countries." The Brit, h cata- 

 logue v, as referred to in the summary for 1884. The present list is 

 based mainly on those of Mallet, Perrey, and Puchs, and aims to give 

 for each of the localities, arranged in alphabetical order, the nun.ber ot 

 recorded earthquake shakes, with their dates and condensed indications 

 of the area affected. It forms a quarto volume of 220 pages. O wing o 

 the difficulty of making any numerical estimate of intensity, especially 

 ,vith reference to shocks in past years, of which no sufficient de ails are 

 now available, that element has been omitted in preparing this list, and 

 it represents only the number of recorded earthquakes, the unit adop eu 

 heino- the " shock." The earthquake map of Europe, for which this list 

 is intended to be the basis, has not yet appeared, but will be prepared 



'''" Observations on the Volcanic Eruptions and Earthquakes in Ice- 

 land " bvG. H. Boehmer,has been printed by the Smithsonian Institu- 

 tLn 'from advance sheets of the Report for 1885. The first nineteen 

 pa-es of this pamphlet are translated and condensed fro.u a history by 

 Th" Thoroddsen and describe the location of the active volcanoes. It 

 is stated that " volcanic eruptions appear to be confined to two loca i- 

 ties, one in the south of the island, running from southwest to north- 

 east, and the other in the north, running from south to north The 

 volcanoes which have been active within historic times are classified 

 ceooraphicallv into eight groups, and under these headings they are 

 described at some length. There follows a chronological and descrip- 

 tive list of volcanic eruptions and earthquakes, beginning with Katla, 

 about 900 A. 1)., and coming down to 1879. About twenty localities 

 are named where eruptions have occurred. Of the large volcanoes 

 Hecla has theflrst place with twenty-one eruptions. After it come Katla 

 with twelve or thirteen, the Eldeyjar,near Reykjanes, with ten, and the 

 Trolladyngja with six. The earthquakes are in evident connection 

 with the volcanic activity. The remainder of the pamphlet, about 28 

 pages is occupied with a valuable bibliography of the volcanoes, earth- 

 Quake's and geysers of Iceland, founded on a similar list by Thoroddsen 

 but much extended by Mr. Boehmer. It names fifty-eight manuscripts, 

 besides the numerous books and articles in journals. 



In studying the slight* earthquakes of January 5 and 17, 1886, in 

 southern New Hampshire, W. M. Davis prepared ( Appalachia, iv, 190), 

 from the data in Rockwood's lists an outline map showing the areas m 

 New England affected by earthquakes from 1872 to 1884, from which it 

 appears that southern New Hampshire is the most frequently disturbed 

 reo-ion. Professor Davis's detailed study of these shocks also confirms 



