CONTENTS. V 



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On a Comet, Gabry 677 Censure of Mercator's Chart, Dunn 696 



Transit of Venus, Ferguson 68.5 Mountaine . 667 



Occultation of Jupiter, Dunn ibid Longitude of Greenwich and Paris, Short. . 713 



Transit of Venus, Wargentin 695 



4. Mechanics, 



The Mechanical Powers, Hamilton 706 Friction in Engines, Fitzgerald 709 



5 . Hydraulics. 

 Fall of Water under Bridges, Robertson .. 193 



6. Pneumatics.^ 

 Ascent of Vapour, Darwin 124- 



7. Acoustics, Music. 

 Ancient Greek Music, Eyles Stiles 483 



8. Optics. 



Nocturnal Solar Iris, Edwards 137 Horizontal Sun and Moon, Dunn 611 



Refrangibility of Light, Dollond 267 Double Refraction in Crystals, Beccaria . . 6l5 



Aberration of Light, Klingenstiern 514 Refracted Light Colourless, Murdoch .... 6I8 



Maskelyne 517 



9. Electricity, Magnetism^ Pyrotechny, Thermometry, &c. 



The Leyden Experiment, Wilson 15 Diurnal Variation of the Needle, Canton. . 421 



Thermometer at the Hague, Trembley. ... 97 Electrical Experiments, Beccaria 435 



New Thermometers, Lord C. Cavendish . . IJ8 ' ~ - Franklin ibid 



Variat. of the Needle, Dodson, Mountaine 149 Artificial Cold at Petersburg, Himsel 480 



Heat of the Air in July I7i7, Huxham .. 176 Metalline Thermometer, Fitzgerald. .... . 491 



Electricity on Paralytics, Franklin 189 Electrical Experiments, Wilson 504 



Heat at Edystone, &c. Smeaton 191 Electrical Observations, Bergman . . 506 



Effects of Heat in July 17>'i7, Huxham, . , . 204 New Barom. and Thermometer, Fitzgerald 543 



Electricity in Diseases, Brydone 262 Great Cold at Petersburg, Watson 544 



Heat of the Weather in Georgia, Ellis ^77 On NoUet's Electricity, Watson 580 



Magnetism in Brass, Arderon 285 Electrical Experiments, Delaval 689 



Electrical Experiments, Delaval 334 • Canton, Franklin, . 609 



Electricity on Paralytics, Himsel 372 Conductors of Lightning, Watson 6'60 



Experiments on the Tourmalin, Wilson . . 396 Use of Electricity in a Tetanus, Watson . . 679 



Electrical Experiments, Symmer 405 Degree of Cold at Berlin, Pallas 694 



Electrical Cohesion, Mitchell 418 Electrical Experiments, Kinnersley 702 



Lyncurium of the Ancients, Watson 419 Electricity and Thunder, Bergman 705 



Class III. Natural History^. 



1. Zoology. 



New Species of Snipe, Edwards 130 Dissert, on Zoophyes, Baster 537 



Small marine Animals, Baster 131 On the Cepphus, Lysons 541 



Remarks on the same, Ellis 134 Encrinus or Star- fish, Ellis 590 



American Sea-Sun-Crown, Peyssonel 307 Noxious Animals, Forster 6l4 



Rare Species of Barnacles, Ellis ibid A Marine Animal, Russel 635 



Limpet Fish of Bermuda, Forbes Morton. . 313 The Cochineal Insects, Ellis 674 



Sea Millepides, Peyssonel 326 A Species of Wasps, Bartram 685 



Felis Caracal of India, Parsons 474 A marine Insect, Du Pont 695 



Frog-fi>h of Surinam, Edwards ibid Remarks on Swallows, &c. Achard 705 



Bird from a Turkey and Pheasant, Edwards 493 On the same, CoUinson 706 



A kind of Bees, Eyles Stiles 496 A Remarkable Fish, Ferguson 717 



Urtica Marina, Gaertner , 5 25 



2. Botany, 



Rare English Plants, Puiteney 45 Catalogue of 50 Plants, Apothecaries, 124, 246 



China and Japan Varnish Tree, Ellis 46 338, 473, 530, 6l5, 685 



Deadly Nightshade, Puiteney 85 Toxicodendron and Varnish Tree, Miller. . 177 



