CONTENTS. 



Proceedings of the Horticultural Society , • 



Astronomical and Nautical Collections. 



i. Elementary View of the Undulatory Theory of Light. By 

 M. Fresnel ..... 



ii. Principal Lunar Occnltations of the fixed Stars, in the 

 months of November and December, 1828, and January, 

 1829, calculated for the Royal Observatory at Greenwich. 

 By I. Hendsrson, Esq. . * 



Page 

 164 



168 



192 



MISCELLANEOUS INTELLIGENCE, 



I. Mechanical Science. 



Page 



1 TuUey'a New Catadioptric 



Microscopes 193 



2 Carpenter's Aplanatic Solar 



Microscope 194 



3 Improvement in the Barometer 195 



4 Effect of the Moon upon Baro- 



metric Pressure ib. 



5 On the Arrangement of Water 



Pipes in the Streets 196. 



C New Razor Straps 197 



7 On the Fusion of Tallow ib, 



8 Method of hardening Plaster 



Casts and Alabaster 198 



9 Injurious Colours ib. 



10 Method of preventing Milk 



from turning sour 199 



11 Internal change in the Po- 



sition of Particles in Solids . . ib. 



II. Chemical Science. 



1 Conducting Power of Metals 



for Electricity 199 



2 Conducting Power of different 



Fluids for Voltaic Electricity 200 



3 Influence over the Electric 



Powers of Metals ib. 



4 On the secondary Piles of 



Ritter ib. 



5 Comparison of the Tourmaline 



and bad electro-conductors ... 201 

 (i Electro-magnetic Current from 

 heated fluids 202 



7 Purity of Metals tested by the 



Galvanometer 203 



8 Construction of Magnetic 



Needles.. ii. 



D Alteration of Brass Wire in 

 the Air 204 



10 New Solar Phosphor! ib. 



11 Preparation of Iodine 205 



12 Action of Ammonia on heated 



Metals ib. 



13 IMethod of collecting Air for 



Analysis 20G 



14 On the Hypo-phosphites ib. 



15 OuPyrophorus 207 



16 Test of Potash by Nickel, 



before the blow-pipe 209 



17 New Variety of Borax ib, 



18 Mutual Action of Nitre and 



Sal- Ammoniac ib, 



19 Preparation and Properties of 



Aluminum, &c ib. 



20 Chloride of Glucinum 211 



21 Metallic Cerium ib, 



22 Use of Chameleon Mineral for 



marking Linen 212 



23 Reduction of Oxide of Copper 



by Ii'on and Water 213 



24 Separation ofSilver and Copper ib, 



25 Solubility of Sulphate of Lead ib. 



26 Use of Red Sulphuret of Ar- 



senic, or Realgar, in dyeing ib, 



27 Opaque and Transpai-ent 



White Arsenic 214 



28 Reduction of Snlphuiiet of 



Arsenic ib, 



29 On a ne w use of the Chromate 



of Potash 215 



30 Chloride of Silver and Sodium 21G 



31 Nitrate and Sulphate of Am- 



monia and Silver ib. 



