538 Caution to Apothecaries and Druggists, 



ration to which the glass of antimony is chiefly applied, the 

 making of emetic tartar; but it is highly needful, for the 

 sake of the consumers of smaller quantities, as in the vi- 

 tnun ceratuvi, and v'murti antimonii, that the following di' 

 stinctive characters of the two be extensively circulated, in 

 order that those, who may have bought the article withiiv 

 twelve or eighteen months past, may assure themselves of 

 its being genuine. The public health, and even the lives of 

 some patients, may be considered as at stake on the occasion. 



Glass of antimony has a rich brown or reddish colour, 

 with the usual transparency of coloured glasses. The glass 

 of lead in question is of a deeper and duller colour against 

 the light, is much less transparent, and even, in some 

 samples, quite opake. 



The specific gravity of the true never exceeds 4*95, that 

 of \)[iit spurious, or lead glass, is 6*95 : or, in round num- 

 bers, their comparative weights are as 5 to 1, 



Let twenty grains be rubbed fine in a glass mortar, add- 

 ing half an ounce of good muriatic acid. The true dissolves, 

 with an hepatic smell, the solution is turbid, but has no 

 sediment. The spurious turns the acid yellow, giving out 

 an oxymuriatic odour, and leaves much sediment. 



Let a little of each solution be separately dropt into wa- 

 ter. The true deposits oxide of antimony, in a copious 

 white coagulum ; or, if the water has been previously 

 tinged with sulphuret of ammonia, in a fine orange preci- 

 pitate — The spurious gives no precipitate in water, and in 

 the other liquid, one of a dark brown or olive colour. 



A solution of the spurious in distilled vinegar has a sweet 

 taste, together with the other properties of acetate of lead. 



A very small mixture of the spurious may be detected, 

 by its debasing, more or less, the bright orange colour of 

 the precipitate, thrown down by sulphuret of ammonia 

 from the solution in any acid. 



The sanjples of the spurious, hitherto detected, are of a 

 much thicker and clumsier cast than the genuine ; but the 

 appearance is not to be trusted, and no specimen should be 

 allowed to pass, without a trial either of the specific gravity, 

 or chemical properties. 



John Morison, living at 143, Holborit Bars, who had 

 the misfortune to lose both arms by the discharge of a can- 

 non, has invented a curious set of instruments, so well 

 adapted for almost every purpose of life, that the want of 

 those limbs to him is wonderfully supplied ; and he under- 

 takes to maka artificial legs, arms, and instruments, on a 



new 



