Tl CONTENTS. 



Page, 

 New mode of Printing Designs — Artificial Slates, • - 191 

 Porosity of Glass, &c. — Metallic Titanium — Congelation of 



Mercury, 192 



New Electro-Magnetic Experiments — Employments of Po- 

 tatoes in Steam-Engine boilers, - - - - 193 

 New Tests of Alkalis and Acids — Colouring' Alum Crystals 



— Green Ore of Uranium, - . - . - 194 

 Prussian Travellers — Electro-Magnetic Apparatus — Com- 

 pression of Water, ---..- 195 



Superior Green Dye, 196 



Artificial Formation of Formic Acid, - - - 197 



Brunei's Saw — Soc. of Nat. Industry, France — Portugal, 198 

 Contagion and Infection — Public Instruction — Society for 



promoting Elementary Instruction, - - - 199 



Animal Heat — Necrology, 200 



Dr. Brewster's Memoirs, ------ 363 



Articles of Foreign Literature and Science, prepared by 



Prof. Griscom, S66 



Ores of Manganese, do. 



M. Stromeyer's Analyses, - 868 



Society at Paris for the encouragement of National Industry, 371 

 Philosophical Instruments — Astronomical Observatory, - 374 



Hydroxanthic Acid, - - 376 



Caligraphy, 377 



Feeding engine boilers — Preservation of Grain, &c. from 



Mice— Yeast, 378 



Paste — Soldering sheet iron, ..... 379 

 Plumbago in coal-gas retorts — Analyses of Uranlte, - 880 



Leipsic Fair — Switzerland — Society for the encourgement 



of industry, St. Gall — Canton of Argow, - - - 381 

 Brussels — Elementary Instruction — University of Leyden, 382 

 Public Instruction — Method of J. Ordinaire, - ^ - 383 

 Sulphat of Rhubarb, - - . - - - - 385 



Schweinfurt Green, 386 



Mineral spring containing Iodine — New and curious variety 



of combustion, 387 



Cutting of Steel by soft iron — Cleavelandite, - - . 390 

 Chinese process for making sheet lead, - . - - 39I 

 Willis' lute — Hydrogen gas apparatus — Method of discover- 

 ing very small quantities of Mercury, - . - 392 



