CONTENTS. XI 



Page. 



37, 38. Alcohol — Rapidity of the Circulation of the Blood, 388 



39, 40, 41, Remarkable phenomenoa in a medicinal com- 

 pound — Discovery of iodine in the ore of zinc — 

 Size of the grains of native platina, 389 



42, 43, 44, 45. Observations on the evaporation of ice — 

 Swiftness of Sound — On the colored flame of Al- 

 cohol — Electricity of the Tourmaline - 390 



46, 47. New method of preserving crystallized salts — 



Conversion of potatoe flour into nutritious bread, 391 



48. Means of detecting the purity of chromate of potash, 392 



49. Decoloring action of Charcoal, - - 393 

 50,51. Manufactory of diamonds — Leeches, - 394 

 52, 53 54, 55, 56. Chloride of lime in psora — Iron furna- 

 ces in England and Scotland — New process for ob- 

 taining gallic acid — Action of iodine on proto- 

 chloride of mercury — New method of preparing- 



the deutoxide of barium, . - _ 395 



57. Precipitation of albumen by phosphoric acid, 396 



58, 59, 60, 61. New fulminating powder— New compounds 



of silica and potash — Marine salt — Delicate test of 

 oxygen in a gaseous mixture, • - - 397 



62. Optical amusements, - - . . 393 



63, 64. Corrosive subiio>ate — Gossamer spider, - 399 

 65. Obituary of Dr. John Gorhara, - - 400 



