118 INDEX. 



Lead, use of the sulphate of, in the arts, xiv. 230. Observations 

 on the deleterious effects of, 352. On the relation between the 

 crystalline form and chemical proportions of the neutral 

 arseniate and phosphate of, 416 



sulphuret of, experiment on, xv. 150 



action of gunpowder upon, xvi. 163. Pyrophorus obtained 



from the tartrate of, 385. Sugar, an antidote to, in case of 

 poisoning, 395 



plaster, water essential to its formation, xx. 400 



Leaden pipes, experiments on the strength of, xx. 375 



Leake (Colonel), copy of an ancient manuscript by, at Alexandria, 

 X. 7 



Leaves of plants, nature of the green matter of, iv. 394 



• new colouring matter found in, vi. 36 1 



Lecanu and Serbal (MM.) on the preparation of the oxide of 

 uranium, xvii. 139. Collection of facts by, on the history of 

 the succinic and benzoic acids, 141 



Lee (Mr.), evidence of, on the application of coal-gas to the pur- 

 poses of illumination, i. 73 



— account of his improvements in dressing flax, iv. 329 



Leeches, medicinal application of, xix. 174 



Leghorn straw-plat, premiums for, xvii. 1 53 



Lebson's (Mr. H. B.) description of a self-acting blowpipe, xvii. 

 236 



Le Gros (Mr. P. T.), notice of his machine for cleaning chimneys, 

 iii. 394 



Leonardi da Vinci, interesting geological observations of, vi. 

 380 



Lepidolite, identity of, with mica proved, iii. 84 



Leslie (T., Esq.) analysis of his treatise on meteorology, with re- 

 marks, xiv. 172 



■ invention of, for conducting examinations under 



water, xviii. 167 



Letters, benefit of the revival of, vii. 213 



Leuthwaite (Mr.), experiments of, for firing gunpowder by elec- 

 tricity, xi. 391 



