PAGE 



13. Of the tides . , ,44 



14. Of currents in the sea . . 45 

 Methods of making sea water fresh . .48 

 Method of keeping fresh water sweet . 49 

 Sketch of Mr. Hervey's reflections on what is ob- 

 servable in the terraqueous globe . 4962 



Curious remark or Dr. Cheyne concerning fluids in 



general . ib. 



Of the islands of Scilly, so noted among the ancients 6i 



)5. Of subterraneous trees . . $9 



Subterraneous trees rn Italy .. 70 



' trees in Ireland , . ib. 



in Norfolk, Suffolk, Cambridge, 



Huntingdon, &C.&G, . . 72 



16. Of the origin of bogs . ib. 



Of several bogs in Ireland : , 73 



Of somelarge ones in England . 74 



A remarkable one in Scotland 77 



CHAP. II. 



1. Of the effects and nature of fire . ? 

 Of heating cold liquors with ice , 81 

 Different degrees of heat in the same latitude . ib, 



2. Of the generation and nourishment of fire . 2 



a 2 



