Page:Philosophical Transactions - Volume 001.djvu/348

 surface of the ground, and employed to collect the Dew? And whether the Rain that falls there, and may be supposed to come thither from elsewhere, will discolour such Clothes, or afford any residence of a Mineral Nature?

16. Whether the Place be more than ordinarily subject to Thunder and Lightning, and to sudden Storms or Earthquakes; as likewise to Nocturnal Lights and fiery Meteors.

17. Whether Mists use to rise from Grounds stored with Minerals? What is observable in them, and what Minerals they signify, and may be supposed to be produced by?

18. Whether the Virgula Divinitoria be used to find out the Veins of proposed Mines; and, if it be, with what success?

19. What other Signs above ground afford probability of Mines, or Direction for following a Vein over Hills, Valleys, Lakes, Rivers, &c.

The Second sort of Signs belonging to these Quæries, are such as follow.

20. Whether there be any Clayes, Marles, or other Mineral Earths, yellow or liquid matters, that usually give notice of the Ore? And if there be more than one, how and at what depths they are wont to lye respectively? Of what thickness and consistence they are; and in what Order the Diggers meet with them?

21. Whether there be any Stones or Marchasites to be found neer, or not very far from the surface of the ground, by which one may have ground to expect at Mine? As is often observed in the Tin-Mines of Cornwall, over which such kind of Stones are divers times found lying above ground?

22. Whether all Stones of that kind do equally signify that Mine? And, if not, how the significant Stones are to be known, as by Colour, Bigness, Shape, Weight, Depth under ground, &c.

23. Whether there be any Earths of peculiar kinds, as to Colour, Consistence, &c. that indicate a Mine beneath or near them; and, if there be, what they are, and what is their consecution, if they have any?

24. Whether Heat or Damps give any assurance or a probability of finding a Mine? Rh