lioyal Geological Society oJCorn'walL 71 



nOYAL GEOLOGICAL SOCIETY OF CORNWALL. 

 Eighteenth Annual Report of the Council. 

 [The Council commence their Report with noticing the Address 

 to the King, voted at the last Anniversary Meeting (see Phil. Mag. 

 and Annals, N.S. vol. viii. p. 461), and announcing that in com- 

 pliance with it His Majesty had become the Patron of the Society, 

 and that he had also ordered an annual donation of 20/. toils funds. 

 After submitting for the approval of the Society a further .'Address 

 to the King (which was adopted accordingly), they proceed as 

 follows : ] 



The principal points which the Council have to notice this year 

 are, the general survey of the surface of Cornwall by Dr. Boase, 

 and the investigation of the mines by Mr. W. J. Henwood. The 

 former gentleman, they are happy to say, has nearly completed his 

 labours, and has laid the result before the Society, in an elaborate 

 and comprehensive memoir of the rocks of the different districts, 

 — their peculiar situations, — their apparent and probable relation 

 to, and connection with, each other, — their alternations,— the veins 

 which intersect them at the surface, &c. &c., — with such con- 

 clusions as he considers legitimate and warranted by the facts as 

 well as by analogy. This memoir he has illustrated by above 

 1000 specimens, which are placed in a separate cabinet in the 

 Museum, and exhibit the geology of Cornwall more generally and 

 more distinctly than any previous researches had done. Another 

 desirable result of his labours (which has long been a great desi- 

 deratum with the Society) will be the completion of a Geological 

 Map of the whole surface of Cornwall: on this he has for some 

 time been engaged, and has nearly finished it. Mr. Henwood, al- 

 though he has been diligently employed for a considerable part of 

 the last year, has yet a great deal of work to perform. Amongst 

 the points which occupy his particular attention, may be noticed, 

 1st, The relation between the metalliferous veins and the strata in- 

 tersected by them, which appear in the changes which occur in the 

 former, being attended with correspondent alterations in the latter : 

 and 2nd, The electro-magnetic properties of the different veins, 

 which he endeavours to ascertain, by the experiments first insti- 

 tuted by Robert Were Fox, Esq.; — the latter point may possibly 

 have a strong bearing on the former: the Council, therefore, look 

 forward to the result of this investigation, with the hope that some 

 additional light may be thrown on these subjects*. 



The fourth volume of the Society's Transactions, which was 

 commenced immediately after the last annual meeting, has been 

 delayed, in order that Dr. Boase's and Mr. Kenwood's communi- 

 cations might be included in it: the former will occupy a consider- 

 able part of it, but the latter will probably be sufHcient for another 

 volume. 



The principal additions to the Cabinet, in the present year, have 

 been made by the two gentlemen before mentioned ; the series by the 

 fir.'st, being illustrative of the Cornish rocks generally ; that of the 



• See our last volume, p. 358. — Edit. 



latter, 



