* ■• 



CONTENTS. Ill 



2, 3. Poi?5oauus corifeclionary — Memoir oii hydforCjraiuc ucid, 157 

 4, Efficacy of chlorides, - - - ' - ,- - 



159 



5- Deleterious ofi'ecls of sulphuretted liydrogen. - - 1€0 



G, 7, 8. Cleansino^ of sewers — Chlorine — Ilydriodic ether, 161 



9. Analysis of bile, - - , - l l . 1(52 



NATURAL HlSTOZiV- 



162 



U>4 



1. Analysis of the Russian platina, - - . - 



2, 3, On the silicate of iron, of Badeoniais — On anew mineral, 



hydro-carbon, - - - - - - . - 



4. Means employed by the spider in weaving its web, - 165 



5. Phosphorescence of sea water, - - - - - IG6 



6. 7. Analysis of a new mineral, from Hoboken — Temperature 



r 



of the atmosphere and of plants. Sec. - - - 167 



■ 



8. Helvetic Society of Natural Sciences, , - . , - - 168 



9. Determination of the time which a drowned pei^on has been 



under water, 



170 



MECHAMCAL PHILOSOPHY. 



1. Matrnetic influence of the violet rav, - - - - 171 



2, 3- Iron works of Sweden — Calorific effects of the Voltaic pile, 173 



4. Electro-magnetic property of carbon, - - - - 175 



5. On the deflection of light, - - " - - - * . 176 



6. Preservation of firemen against fire and flame, - - 177 



7. 8. Plumbago instead of oil in watches and chronometers 



Optical surgery, - - - - ' " 



. - - - ^ - - 179 



9, A remarkable watch, - - - r- - 180 



!0. Mag-netic influence of the solar beam. "- -' - IHl 



STATISTICS. 



L^.- 



1, 2. Number of pupils in the universities of the Netherlands 



in 1827 — Peruvian geography and geognosy, - 182 



3.' Revue Encyclopedique, - - - - "- . 184' 



-1, 5. Comparative number of books which appear in France 



and Germany — Vauquelin, - - - - - 



185 



MISCELLANIES FOREIGN AND DOMESTIC, 



1. Veofetable coIorin<>* materials in Canada, - - - ..186 



2. Phosphorescence of the sea in the Gulf of St. Lawrence, 187 



3. Antarctic expedition. ------- 188 



4. Gold and platina, - - - - - - - 190 



5. 6. Rock crystals sfuhstituted for crown glass in making tele- 



scopes — On the temperature of the sea, - - 101 



7. Proceedingsof the Lyceum of Natural History, of New York, 193 



