464 Notices of Memoirs — Blake's Geology of Yesso. 



R. Russell, C.E., F.G.S. — The Permian Breccias of the Country near Whitehaven. 

 L. C. Miall — Second Report of the Committee on Coal-measure Labyrinthodonts. 



The Classification of tlie Labyrinthodonts. 

 H. Willett and W. Topley — Second Report on the Sub-Wealden Exploration. 

 Dr, W. B. Carpenter — Further Researches on Eozoon canadense. 

 J. Gwyn Jeffreys — Note on the so-called Crag of Bridlington. 

 E. T. Hardtnan — On the Age and Mode of Formation of Lough Neagh. 

 Rev. H. W. Crosskey — Report of the Committee for Recording Information on the 



Erratic Blocks of England and Wales, 

 y. Thomson — Report of the Committee for Investigating Mountain Limestone 



Corals. 

 Prof. A. S. Herschel 2Si^ G. A. Lebour — Report of the Committee for Carrying on 



Experiments on the Conducting Power for Heat of certain Rocks. 

 Dr. Bryce — Report of the Committee for Observations and Records of Earthquakes 



in Scotland. 

 yoseph Wright — On the Discovery of Microzoa in Irish Flints. 

 Rev. Dr. Grainger — On the Fossils of the Post-Tertiary Deposits of Ireland. 

 Prof. Hull — On the Progress of the Geological Survey of Ireland. 

 W. A, Traill — On Geological Sections in the County Down. 

 E. T. Hardman — New Localities for Upper Boulder-clay in Ireland. 

 G. Langt7y — On the Occurrence of the Middle Lias at Ballycastle. 

 Dr. Vaughafi (communicated by F. Drew) — Physics of the Internal Earth. 

 Prof. y. Thompson — On the Jointed Prismatic Structure of the Giants' Causeway. 



II. — Notes on the Gteology oe the Island oe Yesso, Japan, from 

 Observations made in 1862. By W. P. Blake.^ 



THE salient features of the geology of the Island of Yesso, Japan, 

 are volcanic. Symmetrical cones, snow-capped for a great part 

 of the year, are the first landmarks that greet the eyes of the mariner 

 as he approaches the coast, and are the last to disappear as he leaves it 

 behind. The cone of Esan, in a solfataric condition, forms the eastern 

 and southern headland of the island, not far distant from the port 

 of Hakodadi and from Eomangadaki Mountain ; another solfataric 

 cone rises conspicuously upon the southern shore of Volcano Baj'" 

 at about the same distance from Hakodadi. This last-mentioned 

 mountain was in a state of violent eruption a few years ago, and 

 threw out an enormous quantity of ashes, pumice, and hot water. 

 Further north, beyond Volcano Bay, the beautiful cone of Shiribets 

 is grouped with several others; all of them are remarkable for 

 their symmetry and grandeur. Most of these volcanic mountains 

 may be regarded as extinct, though many yield quantities of sulphur 

 and emit steam. At an early period their activity must have been 

 prodigious, for almost everywhere throughout the island, or at least 

 the southern portion of it, so far as exj)lored, there is a vast deposit 

 of fragments of trachyte, lava, scoriae and volcanic debris. These 

 materials are generally in the form of a stratified brecciated con- 

 glomerate, sometimes alternating .with finer materials, such as beds 

 of sandstone and volcanic ashes. 



A coarse conglomerate of this formation is found bordering the 

 island from Esan nearly to Koraangadaki, and extensively upon the 

 western coast, as in the neighbourhood of Iwanai. It is also found 

 extensively developed in the interior. 



^ From the Transactions of the Connecticut Academy of Arts and Sciences, vol. ii. 

 part 2. Eead February 21, 1872. 



