Reports and Proceedings — Royal Institution of Cormvall. 317 



Tn conclusion, we tliink Newcastle is fortunate in having local men 

 who not only collect, but can also well describe and illustrate what 

 they collect; for besides our author, Messrs. Hancock and Atthey 

 have written some most valuable scientiiic papers upon the verte- 

 brates of the Carboniferous period obtained from the strata of this 

 important Coal-producing emporium. 



I. — EoTAL Institution of Cornwall. 



THE spring meeting of the Eoyal Institution of Cornwall was held 

 at Truro on Friday, the 16th of May. Dr. Jago, F.E.S., V.P., 

 presided, in the absence of Sir John St. Aubyn, Bart., M.P., the 

 President. The following papers were read : — 



On the Detrital Tin-ore of Cormvall. By William Jory Henwood, 

 F.E.S., F.G.S., sometime Her Majesty's Assay-Master of Tin in the 

 Duchy of Cornwall. — This memoir contains a summary of observa- 

 tions made at intervals during the past five-and-forty years. Of the 

 four districts into which the writer divides the field of his labours, 

 the first extends from the Land's End to the eastern sources of the 

 Hayle river ; the second is included between the Camborne, Crowan, 

 Wendron, and Constantine granite, and the eastern tributaries of 

 Eestronguet, a creek of Falmouth harbour. The third is bounded 

 on the west by the Truro river, and the Gannel, and on the east by 

 the Fowey and the lower part of the Camel. The fourth reaches 

 from the eastern part of the third to the Tamar. Throughout Corn- 

 wall the water-shed is much nearer to the north than to the south 

 coast. A short notice of the general characteristics of each district 

 precedes particulars of the stream-works now or lately wrought. 

 And here it may be remarked that the Land's-End region contains no 

 fewer than eleven logan roclzs, of which seven are in the single 

 parish of Zennor, and amongst these three are so closely placed, that 

 sufficient force applied to one moves them all. The first district in- 

 cludes the detritus explored at Bosworles, Penrose, Bejowans, Tre- 

 gadgwith, Coldharbour, Tregilsoe, Marazion-marsh, and St. Erth. 

 The second comprehends the Wendron Moors, which have been 

 wrought from remote antiquity to the present time, the instructive 

 works long, but we fear unprofitably, carried out by Mr. Joshua Fox, 

 near Mawnan, as well as the productive deposit wrought at Carnon, 

 and beneath the navigable part of Eestrongiiet creek, together with 

 its lateral extensions into the Perran Smelting-house creek (where a 

 human skeleton was discovered some fifty years ago resting on the 

 tin-ground at low-water mark, compressed by longitudinal and cross 

 bars of wood and covered with rocks of quartz), as well as in the Perran 

 Wharf Valley, where quantities of inflammable gas issued from the 

 vegetable remains, which rested on the tin-bed. The third embraces 

 Pentuan, the St. Austell, Luxullian, Lanlivery, St. Stephen's,' St. 

 Dennis, and Tregoss Moors, together with the interesting deposit at 

 Treloy, in St. Columb Minor, were coins, celts, fihulce, and a remark- 



