CONTENTS. 



VII 



Page 



Foul Air in Mines, Desaguliers 76 



Inflammable Air, John Maud 77 



On Barometers, H. Beigliton 198 



Foul Air in a Well, B. Cooke 244 



Force of Steam, J. Clay tonr 335 



I' age 



Force of Steam, J. Payne 518 



Sutton's Ventilators, Dr. Mead 553 



, Wm. Watson 56o 



Heights of Barometers, 8. C. HoUman . . 578 



8. Optics. 



Combinations of Lenses, J . Hadley 54 



Catoptric Microscope, Dr. Barker 73 



Catoptric Telescopes, C. Smith 393 



Leuwenhoeck's Microscopes, H. Baker . . . 44S 



Grinding of Lenses, Sam. Jenkins 451 



A Reflecting Instrument, Sir L Newton . . 590 



g. Magnetism, Electricity, Thermometry. 



The Electrical Light, Stephen Gray 2 



Magnetism by Lightning, Dr. Cookson . . 24,25 

 Electrical Experiments, Stephen Gray .... 51 

 Electrical Rotation in Bodies, Stejjhen Gray 65 



Quicksilver Thermometer, De Lisle 66' 



Magnetical Variations, Middleton 76 



Expansion of Metals by Heat, Ellicott ... 82 

 Magnet. Needle aft'ectcd by Cold, Middleton 224 

 Magnets of more than 2 Poles, J. Eames . . 246 

 Magnetical Experiments, Desaguliers. . 246,247 

 , Gr. Wheeler ... 306 



On the same Experiments, Dr. Mortimer. . 313 

 On Gray's Electrical Rotations, Wheeler.. 3l6 

 Variation of the Compass, W. Hoxton . . . 339 



Cause of Electricity, Desaguliers 340 



Electrical Experiments, Desaguliers 346,350,351, 

 352,353,357 ,470,472,473,479 

 Magnetism by Lightning, De Bremond . . . 483 

 Observations on Electricity, Desaguliers . . 546 

 Uncommon Warmth of Air, H. Miles . . . 548 

 Electrical Conjectures, Desaguliers 584 



Class III. Natural History. 



1. Zoology. 



Catesby's Natural History of Carolina, Mor- Phoca, or Sea Calf, Dr. Parsons 658 



timer 32,73,235 Eels in Vinegar, H. Miles 674, 



Moose-Deer, Stag, Flying Squirrel, Dale 102 Fresh -wrater Polypus, Mart. Folkes 67S 



Narhwal, or Unicom Fish, Steigertahl. . . . ]60 Observations on Insects, Bonnet 6821 



— , Dr. J. H. Hampe . . 16I On Polypi, by the Duke of Richmond .... 685 



Uncommon Water Insect, Klein ibid Worms living after cut, Thomas Lord .... 692 



, by Brown and Mortimer l63 A Zoophyton, G. Hughes 717 



Worms that destroy Timber, Dr. Raster . . 378 A Dried Polype, H. Baker 724 



Sun-Fish, and its Glue, Wm. Barlow 402 Worms in Smutty Com, T. Needham 7J9 



Teeth of the Rattle Snake, Dr. Bartram . . 409 



2. Botany. 



Catalogue of 50 Plants, Isaac Rand 1,54,113, 



160,278,384,424 



Botanical Observations, Moekring 358 



Letters within a Tree, Klein 359 



Deer's Horn in an Oak, Sir J. Clark 360 



Remarks on the same. Dr. Mortimer . . 

 Scurvey-grass of Greenland, Nicholson 

 Haller's Enum. Math. Slirp., Watson . . 

 Catalogue of 50 Plants, Jos. Miller . . . . 



3. Mineralogy. 



Copper-water in Mines, Mat. Bell 236 



Spirit of Coals, John Clayton 295 



Nitrous Particles in the Air, Clayton .... 296 



Petrifactions at Matlock, Mort. Gilks 406 



Le Bruyn's Petrified Oysters, Klein 455 



Coal-balls at Liege, &c. Hamburgh . . 

 Observ. at Hudson's Bay, Middleton 

 Nature of Amber, J. A. Beurer . , , . 

 Malmy Concretions, T. Needhara . . . 



361 

 391 

 655 



725 



483 

 591 

 631 



729 



