VI 



CONTENTS. 



MISCELLANEOUS INTELLIGENCE. 

 I. Mechanical Science. 



Page 



1 Test of the Action of Frost and 



Weather on Building Materials 421 



2 Connpression of Water in diflfer- 



ent vessels A22 



3 Maximum Density of Saltwater 423 



4 Propagation of Sound 424 



5 Experimental Velocity of Sound ib. 



6 Syphon Hydrometer ib. 



Page 



7 Alteration of weight in Rock 



Crystal 425 



8 Friction of Screws and Screw- 



presses 426 



9 Paper Linen ib. 



10 Hardening of Steel ib. 



11 Dyeing of Wool with Prussian 



Blue 427 



II. Chemical Science. 



1 Electro-chemical Theory of 



Combination 428 



2 Chemical Powers of Magnetism 429 



3 Effect of Magnetism on the Pre- 



cipitation of Silver ib. 



4 Magnetism of Galvanometer 



Wires, &c 431 



5 Early History of Electio-Mag- 



netism ib. 



6 Intense Light 432 



7 Atomic weight of Bodies .... ib. 



8 Test of the presence of Oxygen 433 



9 Combinations of the Nitrous 



Oxide with Salifiable Bases . 434 



10 Decomposition of Boracic Acid « 



by Hydrogen ib. 



1 1 Preparation of Hydriodic Acid 435 



12 Formation of Cyanide of Potas- 



sium ib. 



13 Phosphoric Acid of Potash . . . ib. 



14 New Compound of Silica and 



Potassa ib. 



15 Fulminating Powder ...... 436 



16 Crystallization of Sulphate of 



Potash ib. 



17 Double Saline Compounds obtained 



by Heat and Fusion ib. 



18 Two Sulphates of Manganese . 438 



19 Carbon in Pig Iron ib. 



20 New Metal, Pluranium ib. 



21 Preparation of Titanic Acid . . 439 



22 Volatilization of Silver 440 



23 Crystallization of Argentiferous 



Salts ib. 



.24 Argentiferous Precipitate ana- 

 logous to Purple of Cassius ib. 



25 Colouration of Gold 441 



26 Absorbent powers of Salts for 



Water ib. 



27 Production and Nature of Al- 



coates 442 



28 New Vegeto- Alkalies 443 



29 Amylic Acid 444 



30 Pinic Acid 445 



III. Natural History. 



1 Mineral or Native Naphthaline 446 



2 Aerolites contained in Hail . , . 447 



3 On Amber ib. 



4 A Lightning Stroke at Sea . . . 448 



5 Height of the Aurora Borealis . ib. 



6 Aurora Borealis ib. 



7 Composition of the Mud of the 



Nile 449 



8 Method of preserving Seeds . . ib. 



9 Preparation of Grain and Seeds 



by Chlorine ib. 



10 Emjjloyment of Slates for hast- 

 ening the maturation of Fruits 450 



Meteorological Table for October, November, and December 

 Index . . 



11 Exhalation of Chlorine by Ma- 

 ritime Plants 450 



12 Change of Colour in Leaves . . ib. 



13 On a new kind of Salad ib. 



14 New kind of Coffee 451 



15 Maturation of Wine ib. 



16 Wholesomeness in Mushrooms ib. 



17 Artificial Incubation ib. 



18 Prevention of DeathfromPoison 452 



19 Hydrophobia in Foxes .... 453 



20 Preservation of Eggs 454 



21 Egyptian Manuscript ib. 



456 

 467 



