552 Remeivs — Bryce\ Oeology of Arran. 



Two plates of horizontal sections are given, wliicli are described 

 by Mr. Hi;gbes. Mr. Aveline gives a brief notice of tlie Alluvium ; 

 a detailed description of which, is reserved for another memoir, 

 explanatory of the Drift deposits of the area. 



This little work contains a great deal of information condensed 

 into a small compass, and at the same time it is furnished in a very 

 readable style. 



II. — Eepoet of the Miners' Association of Cornwall and Devon- 

 shire. 8vo. (Falmouth, 1872.) 

 THIS Eeport contains, among other matters, some observations by 

 Mr. Wm. Argall on " Gossans." He defined " gossan " as a 

 mixture of cellular quartz and earthy oxide of iron, often found in the 

 upper parts or " backs " of mineral lodes. He also stated that oxide 

 of tin was, in Cornwall at least, a very common ingredient in gossan. 

 It results from the partial decomposition of the upper part of the 

 lode, and is generally valuable as an indication of metalliferous 

 deposits. Grossan is particularly characteristic of copper lodes. The 

 backs of tin lodes do not usually show so much gossan as those of 

 copper or iron lodes, although in some instances gossan has been 

 seen at depths of thirty fathoms. In lead lodes, associated with 

 pyrites, it often happens that before the lead ore is reached, the 

 miners come upon a variety of green and brown gossans of different 

 mineral and chemical characters. 



Captain Maynard read a paper on "Heaves" and "Slides"; 

 Captain Noble made some remarks on lodes of iron ore in the parish 

 of Constantino ; and Mr. H. Stephens described the mineral phe- 

 nomena of Huel Eose in the parish of Sithney. 



III. — Post-Glaoial Geology of Lancashire and Cheshire. 



IN the Geological Magazine for March we published a paper by 

 Mr. T. M. Eeade on the Post-Glacial Geology and Pliysio- 

 graphy of West Lancashire and the Mersey Estuary. The author 

 has communicated a paper treating of the same area to the Liverpool 

 Geological Society. It is accompanied by a large coloured map, 

 showing the deposits between the Mersey, Dee, and Eibble ; these 

 are the Boulder-clay, Washed-drift sand. Inferior peat and Forest- 

 bed, Formby and Leasowe Marine beds, Superior peat and Forest- bed, 

 and Eecent Silts. There are also two plates of horizontal sections 

 and one of vertical sections, all coloured. 



I^:E:3A7"I:e]"W"S 



I. — The Geology of Arran and the other Clyde Islands ; with 

 AN Account of the Botany, Natural History, and Antiqui- 

 ties. By James Bryoe, M.A., LL.D., F.G.SS.L. & I. (Glasgow 

 and London : Collins, 1872.) 



DE. BEYCE'S serviceable little work — chiefly occupied with the 

 attractive subject of the geology of Arran — has now reached a 

 fourth edition. When a book arrives at this stage, its merits have 



