I. Watson's Abstract of Franklin's Electrical Experiments and II. Letter from the Abbé Nollet to Benjamin Franklin, III. Speech of the Earl of Macclesfield, President of the Royal Society, on the Occasion of awarding to Franklin a Medal for his Discoveries in Electricity, IV. Letter from John Baptist Beccaria to Benjamin Franklin, V. Letter from Professor Thorbern Bergman, of Upsal, to Ben- LETTERS AND PAPERS ON PHILOSOPHICAL SUBJECTS. PART FIRST; COMPRISING PRIVATE LETTERS TO THE TIME OF THE AUTHOR'S FIRST MISSION TO ENGLAND. 1725-1757. PART SECOND; COMPRISING LETTERS, PRIVATE AND OFFICIAL, FROM THE TIME OF THE AUTHOR'S FIRST MISSION TO ENG- PART THIRD; COMPRISING LETTERS, PRIVATE AND OFFICIAL, FROM THE BEGINNING OF THE AMERICAN REVOLUTION, TO PART FOURTH ; COMPRISING PRIVATE LETTERS FROM THE 1785-1790. 11. Pennsylvania Fireplace, (Plate V.) 12. Profile of the Pennsylvania Chimney and Fireplace. - Stafford shire Fireplace. (Plate VI.) 13. Magical Squares, (Plate VII.) 14. Magical Circle, (Plate VIII.) 17. Aurora Borealis, &c., (Plate XI.) 104 XIV.) (Plate 15. Waterspout, (Plate IX.) 16. Armonica, (Plate X.) 18. Improvements in Navigation, (Plate XII.) 19. Chart of the Atlantic Ocean, exhibiting the Course of the Gulf Stream, &c., (Plate XIII.) 20. Illustrating the Causes and Cure of Smoky Chimneys, (Plate 21. Stove for burning Pit-coal, (Plate XV.) 22. Portrait of Mrs. Franklin, Frontispiece, VII. VOL. I. |