VI 



CONTENTS. 



8. OpticSy Perspective. 



Page 



On his Perspective, Dr. B. Taylor 172 



Experiments on Light, Desaguliers 229 



Refrangibility of Light, by ditto 239 



Villette's Burning Concave, Dr. Harris .... 405 



On Myopes, &c. Dr. Desaguliers 424 



Cross Hairs in the Telescope, Dr. Halley . , 494 



Page 



Refrangibility of Light, Desaguliers 607 



Colours and the Rainbow, Langwitli 623 



On the same, by Dr. Pemberton 624 



On the Reflecting Telescope, J. Hadley . . 646 



On tlie same, by the Rev. Ja. Pound 664 



Leuwenhoeck's Microscopes, M. Folkes . . 678 



Q. Magnetism, and Electricity. 



Variation of the Compass, Dr. Halley .... 112 The same, by Dr. Halley 519 



Electrical Experiments, Ste. Gray 490 Magnetical Experiments, Dr. Taylor 528 



Magnetic Variations, W. Sanderson 498 Magnetical Variations, Comvi^all 569 



Class III. Natural History. 

 1. Botany. 



On some Rare Plants, J. Petiver 17 



Cult, of Canary Seed, E. Tenison 18 



Botanicum Hortense 3, J. Petiver 48 



New Plant, &c. in South Wales, E. Lhwyd 73 

 Botanicum Hortense 4, J. Petiver 155 



The same continued, by ditto 168 



The Pareira Brava, Dr. Helvetius 198 



The plants Araliastrum, M. Vaillant 314 



Catalogue of 50 plants. Apothecaries .... 637 



2. Mineralogy. 



Nat. Hist Observations, R. Richardson 45 



Swedish Minerals, J. Petiver 49 



Marble m Ireland, Fr. Nevill 75 



Impressions on Stone, Dr. Stukely 398 



Strata of Coal Mines, J. Strachey 401 



Pits of Fuller's Earth, B. Holloway 674 



3. Geography 



On Mount Vesuvius, S. Valetta 12 



On Lough-Neagh, Fr. Nevill 67 



Subsiding of a hill, Bp. of Clogher 69 



Observ. in New England, Dr. Mather. ... 85 



Topography of Leeds, Thoresby 174 



Peak of Teneriff, J. Edens 177 



Sinking of the Earth, J. Sackette 252 



Observations in Italy, Dr. Robinson 253 



Britain a Peninsula, Dr. Musgrave 293 



4. 



and Topography. 



Eruptions of Vesuvius, Ed. Berkeley .... 3l6 



Sinking of tliree Oaks, P. Le Neve 348 



Ancient Carteia, J. Conduit 387 



Island in the Humber, Chamberlayne . . . 423 



Longit. of Buenos Aires, Dr. Halley .... 549 



Falls of Niagara, P. Dudley 574 



New Island near Tercera, Tho. Forster . . 584 



Longit. of Port Royal, Dr. Halley 619 



Longit. of Carthagena, by ditto 620 



Hydrology. ^ 



Lough-Neagh in Ireland, Fr. Nevill 6? On a Water Spout, Dr. Richardsori 440 



Saltness of the Sea, &c. Dr. Halley 



169 



Class If^. Chemical Philosophy. 

 1 . Chemistry. 



Divisibility of Matter, J. Keill 9I 



Alkaline Salt in Rotten Wood, Robie 499 



Structure of Diamonds, Leuwenhoeck .... 605 



Figures of Snow, Dr. Langwitb 

 On Epsom Salt, John Brown . . 



644 

 662 



