CONTENTS, 



MISCELLANEOUS INTELLIGENCE. 



I. Mechanical Science. 



Page 



1 On Measuring the Force of Pres- 



sure 392 



2 Night Telegraph 393 



3 Chinese Canal ib. 



4 Method of removing Glass Stop- 



pers 394 



5 On the Causes of Diffraction. . ib. 



6 On the Impressions produced 



by Light on the Eye 395 



7 Brewster's Monochromatic 



Lamp • • • 396 



8 Artificial Magnets and their Uses ib. 



9 Application of Magnetism to 



Medicine 397 



Page 



10 Daily Magnetic Variation 397 



11 Use of Muriatic Acid in cleans- 



ing Monuments 398 



12 Preservation of Firemen exposed 



to Flames ib. 



13 Astronomy 401 



14 Achromatic Spectacles 402 



15 Economical Process for imi- 



tating Silver Paper ib. 



16 On the magnetic Influence of ♦ 



the Violet Ray ib. 



17 Dr. Arnot's Natural Philosophy 405 



18 Cement from Iron Filings.,.. 406 



II. Chemical Science. 



1 On the Specific Heat of Elastic 



Fluids 407 



2 Supposed Influence of Magnet- 



ism over chemical or crystal- 

 lizing Powers ib. 



3 On Phosphoric Acid 408 



4 Production of Sulphuric Acid 



from the Vapours of the Aix 

 Waters 409 



5 Carburetof Sulphur decomposed 



by Voltaism ib. 



6 Composition of the Atmosphere 



at Kazan ib. 



7 Disinfecting Powers of Chloride 



of Lime 410 



8 Proportions in which Oil Gas 



and Air detonate ib. 



9 On the proportional Number of 



Lithium ib. 



10 Adulterations of the Iodide of 



Potassium 411 



11 Preparation of red Ferro-prus- 



siate of Potassa ib. 



12 New Method of analysing Alloys 



of Copper and Silver 412 



Page 



13 Artificial Ultramarine 412 



14 A new Earth, Thorina ib. 



15 Analysis of Siliceous Minerals 



by Alkaline Carbonates 413 



16 Gay Lussac on the Action of 



Potassa on Organic Matters.. 414 



17 New Source of Spirit 416 



18 Effect of Ether on Sulphate of 



Indigo ib. 



19 Composition of Malic Acid.. . ib. 



20 Chemical Constitution of Acetic 



Ether 417 



21 New Vegeto- Alkalies obtained 



from Cinchonas ib. 



22 Investigation of Tobacco Nicotia ib. 



23 Preparation of Urea 418 



24 Composition of different Bones 419 



25 New proximate Principle from 



Albumen ib. 



26 To ascertain the Admixture of 



Sulphate of Copper in Bread. 420 



27 Letter of Sig. Carlo Matteucci 



to Professor Gazzeri ib. 



28 On a new Oxide of Manganese 421 



