C0NTKNT8. 



MISCELLANEOUS INTELLIGENCE. 



I. Mbchanical Scibncb. 



P»ge 

 1 On the Adhesion of Screws . . 453 

 li Improvement in Steam-engines ib. 



3 Improved Clock 454 



4 Method of dividing Glass by 



Friction ib. 



5 Use of Soapstone in diminish- 



ing Friction 455 



6 On peculiar Physical Repul- 



sions ib. 



7 On the Magnetic Effects of 



Metals in Motion 456 



8 Duration of the Effects of Light 



upon the Eye 457 



9 On the Measurement of the In- 



tensity of Light t ib. 



Page 



10 On the apparent Decomposition 



of White Light by a Reflect- 

 ing Body when in Motion . . 458 



11 On the Barometer ib, 



12 Easy method of reducing Baro- 



metrical Observations to a 

 Standard Temperature .... ib. 



13 Diamond Lenses 459 



14 Sapphire Lenses for Single Mi- 



croscopes t6. 



15 On a Method of securing and 



Preserving the. Rowmg Pins 



in Boats 460 



16 Cold Injection for Anatomical 



Preparation 46 1 



II. Chemical Science. 



1 Extraordinary Experiments on 



Heat and Steam 461 



2 On the Use of feeble Electric 



Currents, for effecting the 

 Combination of numerous 

 Bodies 462 



3 Crystallization of Metallic Ox- 



ides 465 



4 On Bromine ib. 



5 Elementary Nature of Bromine ib. 



6 Quantity of Bromine in Sea- 



Water 466 



7 Sale of Bromine ib. 



8 Preparation of lodous Acid . . ib. 



9 On a peculiar Nitric Acid, and 



Sulphatfr of Potash 467 



10 On ccruin Properties of Sul- 



phur 468 



11 On i!:e i-Muidity of Sulphur and 



Phosphorus at common tem- 

 peratures 469 



12 Separation of Selenium from 



Sulphur 470 



13 On a new Compound of Sele- 



nium and Oxygen — Selenic 

 Acid 471 



14 Preparation of Hyposulphuric 



Acid 473 



15 Singular Habitude of Phospho- 



ric Acid with Albumen .... 473 



16 Economical Preparation of Deut- 



oxide of Barium 474 



17 Preparation of Aluminum — 



Chloride of Aluminum .... ib. 



18 Mutual Action of Lime and Li- 



tharge 475 



19 New Chloride of Manganese 



discovered ib. 



20 Preparation of pure Oxide of 



Zinc 476 



21 Deuto-Sulphuret of Cobalt ib. 



22 Separation of Bismuth from 



Mercury bv Potassium ib. 



23 Sulphuret of Arsenic propor- 



tionate in Composition to 

 Arsenic Acid ib. 



24 New Double Chromates .... 477 



25 Dobereiner's finely divided Pl». 477 



tina . . 



26 Nevit^^fetals 478 



27 Analysis of Porcelain Pottery, 



&c ib. 



28 On the Composition of simple 



Alimentary Substances .... 480 



29 Preparation of Sulphate of 



Quinia and Kinic Acid, with- 

 out the use of Alcohol .... 482 



30 Pure Narcotine prepared .... 483 



31 Uncertain Nature of Jalapia .. ib. 



32 Preparation of pure Mellitic 



Acid 



33 On a New Acid existing in Ice- 



land Moss 484 



34 Remarks on the Preparation of 



M. Gautier's Ferro-prussiate 

 of Potash, as described in 

 this Journal for July, 1827 . ib. 



