170 Mr Kenwood on Metalliferous Veins. 



2. That the appearances and positions of the horses do not 

 countenance the assumption of their having ever supported the 

 bounding planes of empty spaces. 



3. That the contents of veins varying in different rocks is in- 

 consistent with any theory of their having been filled from above, 

 or by injection, or sublimation from beneath. 



4. That the metallic contents of parallel veins in the same dis- 

 trict being similar in different rocks ; and also in veins in diffe* 

 rent districts not far apart, at right angles to each other, is irre- 

 concilable with their being filled at the same period by electric 

 agency. 



5. That we have no experimental knowledge that rocks now 

 are, or ever were, in opposite electrical states ; our real know- 

 ledge extending to the existence of electric currents in the pre- 

 sent metalliferous contents of veins, in their present places only. 



6. That the heaves and slides are inexplicable on any yet as- 

 sumed direction of mechanical disturbance, which is consistent 

 with the general simplicity of natural causes; and that synchro- 

 nous fissures exhibiting these phenomena are irreconcilable un- 

 less of contemporaneous origin with the containing mass. 



7. That there is no line of distinctions to be drawn between 

 the intersections of small veins found in hand specimens and 

 the larger ones occurring in what have been called true veins, 

 contemporaneous veins, and veins of segregation. 



8. That the only theory yet propounded which agrees with 

 the phenomena is that of segregation, and that so far only as it 

 admits the contemporaneity of the veins and their disturbances 

 with the rocks in which they occur. 



In submitting the foregoing views, I feel I am only exhibit- 

 ing the opinions which practical men in this country have long 

 generally entertained ; and I shall be more than amply recom- 

 pensed for some years of labour I have bestowed on the subject, 

 if I shall succeed in inducing but one of them to record the re- 

 sults of his daily experience for the benefit of his successors.* 



* Professor Jameson, in March 1808, read a paper on contemporaneous 

 veins before the Wernerian Society, which was published in the first volume 

 of the Society's Memoirs ; afterwards, in 1818, a memoir on the same subject, 

 printed in second volume of the Wernerian Memoirs ; and we understand 

 papers on the contemporaneous origin of many veins, by Professor Jameson, 

 have appeared in the Annals of Philosophy and elsewhere. 



