Revieivs — Royal Geological Society of Cornwall. 515 



was due to Professor Eupert Jones for his very full and interesting 

 lecture. He wished further to say that when coursing in the Burgh- 

 clere Valley, he had observed that there was very little flint drift, 

 which was singular, considering the large amount of denudation the 

 Chalk hills had undergone. This had also been noticed by Mr. 

 Bristow, in the Memoir on Sheet 12 of the Geological Survey Map. 

 Dr. Hills, of Basingstoke, intimated that there is a small exposure 

 of the Gault near Burghclere, — [From the Newbury Weekly News of 

 September 26, with corrections by T. E. J.} 



DaiE^^IE'WS. 



I. — Transactions of the Eoyal GtEologioal Society of Corn- 

 wall. Parts I. and H., Vol. VIII. Containing Observations 

 on Metalliferous Deposits and Subterranean Temperatures. By 

 William Jory Henwood, F.E.S., F.G.S., President of the 

 Eoyal Polytechnic Institution of Cornwall. London, 1871. 

 8vo. Triibner & Co. 



THE conditions under which mineral matter has filled fissures in 

 the earth's crust, and thus formed veins or lodes, has long been 

 the subject of observation and study among scientific men, and 

 others who have been desirous of rendering the search for metallic 

 ores more of a science, and less of a speculation, than has hitherto 

 been the case. Careful and accurate observations, therefore, upon 

 all the modes of occurrence of mineral or metalliferous matter, and 

 of the apparent causes affecting their distribution in veins, is of the 

 highest importance to a generalization of facts, and the consequent 

 deduction of sound rules whereby the miner may in future be 

 guided. Of such a character are the many contributions to this 

 study which have appeared in the past volumes of the Transactions 

 of the Eoyal Geological Society of Cornwall, a high place being 

 accorded to those prepared by Mr. William Jory Henwood, who 

 indeed appears to have devoted the whole of his time for many 

 years past to this one subject, and, avoiding all theories and specu- 

 lations, has been content to record what he has himself seen and 

 noted. His works will form a foundation upon which the theorist 

 can erect his edifice. Science, in all its branches, owes much to 

 those who devote themselves to the hard practical work of accumu- 

 lating and recording the minutest details of phenomena coming 

 immediately under their own observation, and who concentrate the 

 whole power of their intellect upon such work. 



The present volume, like one of its predecessors, is occupied 

 exclusively with a continuation of Mr. Henwood's observations on 

 metalliferous deposits and subterranean temperatures, with the 

 exception that in this volume he has extended his sphere of work 

 and carried us to important mining districts in the North-west 

 of India, North and South America, West Indies, the Continent of 

 Europe, etc. In Cornwall and Devon, however, the conditions 

 of the mineral deposits are so varied, that we have in that small 



