CONTENTS. V 



Page 

 XXVI. HISTORY OF MECHANICAL INVENTIONS AND OF PRO- 

 CESSES AND MATERIALS USED IN THE FINE AND 

 USEFUL ARTS, .... 354 



1. Description of a Differential Barometer. By the late W. Hyde 

 WoLLASTON, M. D. F. R. S. - - - 354 



2. Account of a method of measuring the resistance of fluids to bodies 

 passing through them. By James Walkek, Esq. F. R. S. Edin. 355 



f-; 3. On the permanent increase of Bulk in Cast-iron by successive 



heatings. By James Prinsep, Esq. Assay Master of the Mint 

 at Benares, - _ - - 356 



4. Description of a sounding-Board in Attercliffe Church, invented 

 by the Rev. John Blackbuen, Minister of Attercliffe-cum-Dar- 



nal Sheffield. - - - - - 357 



5. Account of a Process for producing a beautiful Blue Colour. By 



M. Braconnot, _ - . - 358 



6. Account of the Process for making Ultramarine, - 359 



7. Inventions for Sharpening Blades of Knives, - - ib. 



8. Description of the Pneumatic Spoon, invented by Mr Gibson, 360 



XXVII. ANALYSIS OF SCIENTIFIC BOOKS AND MEMOIRS, ib. 



The Natural History of several New, Popular, and , Divertmg 

 Living Objects for the Microscope, with the phenomena presented 

 by them under observation, &c. &c. Conjoined with accurate De- 

 scriptions of the latest improvements in the Diamond, Sapphire, 

 Aplanatic, and Amician Microscopes ; and instructions for manag- 

 ing them, &c. &c. To which is added a Tract on the newly dis- 

 covered Test Objects. Illustrated by very highly finished Coloured 

 Engravings, from Drawings of the actual living Subjects. By C. 

 R. Goring, M. D. and Andrew Pritchard. No. I. ib. 



XXVIII. PROCEEDINGS OF SOCIETIES, - - - 362 



1 . Proceedings of the Royal Society of Edinburgh, - ib. 



2. Proceedings of the Society for the Encouragement of the Useful 

 Arts in Scotland, . - - 363 



3. Proceedings of the Cambridge Philosophical Society, - 366 



XXIX.. SCIENTIFIC INTELLIGENCE, - - 367 



I. NATURAL PHILOSOPHY. 



Astronomy — 1. Mr Dunlop's Observations on Encke's Comet, - ib. 



Optics — 2. Supernumerary Rainbows, _ - . - ib. 



Acoustics — 3. Velocity of Sound in the Arctic Regions by Captain Parry's 



Observations, ._----_ 368 



Electricity 4. On the influence of Electricity on the emanation of Odours, ib. 



Galvanism — 5. M. Becquerel on the temperature of Conducting Wires, ib. 



Meteorology. — 6. Mass of Meteoric Iron found in France, - ib. 



II. chemistry. 

 7. Diamonds made artificially in France. 8. Melting point of Silver and its 

 alloys with Gold, _ - - - . 369—370 



