CONTENTS. 



MISCELLANEOUS INTELLIGENCE. 

 I. Mechanical Science. 



Pagfe 

 Medal for Chemical Discoveries ... 216 



1 Motion produced by the contact 



of difierent substances ib. 



2 On a Difference in the Velocity 



of Intense and Feeble Sounds ib. 



3 Distances at which Sounds are 



heard 217 



4 On tlie Effect of Wind upon 



Sound ib. 



5 New Material for Paper 218 



Page 



6 Zinc Roofs 218 



7 Method of obtaining the Figure 



of a Plant ib^ 



8 Assamese method of Blasting 



Rocks ib. 



9 On the Etfects produced by 



Magnets tb, 



10 On the Apparent Motion of a 

 small Body in the immediate 

 neighbournoodofalarger,&c. 219 



II. Chemical Science. 



1 Heat evolved during Combustion 220 



2 Conducting Power for Heat of 



the principal Metals, and some 

 Earthy Substances ib. 



3 On the relation of Water to Hot 



Polished Surfaces 221 



4 On the Tension of the Poles of 



a Voltaic Battery 222 



5 On Efflorescence ib. 



6 Anhydrous Crystals of Sulphate 



of Soda....'. 223 



7 Habitudes of Sulphuric Acid .. 224 



8 On lodo-fluoric Acid ib. 



9 On Testing the Presence of Am- 



monia in a Substance 225 



10 Combination of Lime with Water ib. 



1 1 Examination of Copper. Pre- 



cipitation of Bismuth 225 



12 Brown Oxide of Chromium . . . 226 



13 AcccnsionofArsenicalCobaltOre ib. 



14 Artificial Ultramarine ib, 



15 Ancient Cannon raised from the 



Sea ib. 



16 On the Active Principle of 



Hemlock 227 



17 On the Identity of Althea and 



Asparagine ib. 



18 On Solanic Acid ib. 



19 Purification of Alcohol 228 



20 Formation of Sulphuric Ether ib. 



21 On Proust's Caseous Oxide, and 



CaseicAcid 230 



III. Natural History. 



1 Distribution of Nerves in Mus- 



cular Fibre 230 



2 Disease ofSilkWorms and its cure 221 



3 Temperature below the Earth's 



surface tb. 



4 Extraordinary Instances of Fall 



of Rain 232 



5 Rain at Bombay ib. 



6 Meteorological Prognostication 



observed in the Shetland Isles ib. 



7 Fall of Aerolites 233 



8 Cold and Warm Localities in the 



Valley of Ouse, in Norway... ib, 



9 Inflammable Gas from Salt 



Works ib. 



10 Potash in Mineral Waters ib. 



11 Heating Volcanic Products 234 



12 Large masses of Native Platina ib. 



13 Platina Sand of Russia ib. 



Summary of Meteorological Observations for 1827 . . .235 



Meteorological Table for December, January, and February . 236 



