l2C On the Antihmar Tide. [Feb, 



rear 45° to the north-east ; liut from the falling in of the roofs and 

 other accidents it was impossible 'jr me to ascertain any particulars 

 respecting them, ii is in these veins of heavy spar that the cobalt, 

 silver, copper, and lead, have been deposited. Of the first two of 

 these I could di- cover no trace, tliough there is no doubt that both 

 have been obtained in consideralile quantilv. The fullest account I 

 have been able to meet with of the silver mines is that contained in 

 Sir John Sinclair's Statistical Account of Scotland, under the head 

 Alva. Of tlie cobiilt I have seen no published account. It appeals 

 that both these metals were found in the Alva Hill. 



Copper and lead are still to be found both in the mine behind 

 Castle Ca'.npbell and in the mines of Alva. But the specimens 

 (which alone I could procure) at the entrance, are so much acted 

 upon by the weather, that I cannot venture to attempt any descrip- 

 tion of the varieties of ore that occur. The first named of these 

 mines has been twice opened since the year I76O, but has been 

 abundoned an both occasions. But it is not determined whether or 

 not ihe want of success has arisen from mismanagement or from 

 the unproductiveness of tl'.e mine. From their present state, I 

 found it impossible to make any accurate observations on them. 



Such are the most Jniportant facts that 1 have noticed in the 

 examination I have been able to give to the Ochils. Although the 

 information 1 h.ave collected he imperfect, I trust that the Society 

 Tviil receive it as a pledge of my readiness to contribute all that I 

 can to the science of mineralogy. It may be expected that I 

 should assign the geognostic place of the Ochils. With the limited 

 observations that 1 have made, I could do no more than throw out 

 conjeCtares, whicli would not conduce to the legitimate ends of 

 science. Lentil more extended examinations shall have been made, 

 I must beg leave to confine myself to a simple narrative of facts. 



Article VII. 



On ihe Antilunar Tide. By John Campbell, of Carbrook, Esq. 



F.R.S.E. 



It may perhaps appear not a little presumptuous in one whose 

 professional avocations do not afford the leisure, even had he the 

 requisite talents for abstruse speculation, to call in question any 

 received doctrine of the Newtonian philosophy. I feel the force of 

 the personal objection, and yet venture to submit some observations 

 on the theory of the inferior or antilunar tide.* 



» Alllumgh the Newtonian theory of both (ides lie that which, in its full 

 exlent, is gerieral'v taii;;iit in the school of philosopliy, tlic obvious diffirulties 

 attending ihe solution it gives of the ca'isc of the antilunar tide have not failed to 

 stagger niai)y an ic.ite mind. Mr. Foigu?on was so miirh afraid of encoinitering 

 them, that, rejecting the jjrinciple altogether, he ascribed the two titles, not with- 



