144* SCIENTIFIC NEWS. 



Chr ornate of Lead and of Silver. 



Chromate of Count Mouflin Poufchkin has diflblved both the red lead fpar 



fcad and of filver anc j chromate of diver in nitric acid, by adding a little fugar 

 <liflblved in m- i rt 



trie acid. l " e moment the acid is poured on, and promoting the action 



by gentle heat. The fpar then requires only five or fix parts 

 of acid, the chromate of filver ftill lefs. Nitrous acid gas 

 is evolved, and the folutionjof the former is an amethyft co- 

 lour, of the latter a garnet red, without the lead trace of green, 

 either by reflection or refraction. 



Putrefaction prevented. 



l»ucrefa<aion Dr. Valli having left a pound of fcup in which were twelve 



prevented by or fifteen g ra j ns of red precipitate, expofed to the open air 



for four months, found it exhibited no fign of putrefaction, 



and did not even feem to have undergone any alteration. He 



then repeated the experiment for a month in the height of fum- 



vrithoutlofs of mer » w ' tri lne fame effect. The oxide in the mean time had 



weight or co- neither diminiihed in weight nor altered its colour. 



and by the ^n tms Mr. ^ an Mons obferves, that he has found broth 



combination of keep for years by means of a few grains of mercury in the 



oxigen. £ ate £ ox j c j e anc j c it ra te. Nitrate of filver has long been 



coniidered as the mod powerful of antifeptics, and he has 



found thofe of gold and of mercury equally fo. Oxigenated 



muriate of potato retarded the putrefaction of ftrong foup fe- 



veral days, and ultimately put a fiop to it at a certain point, 



Very dilute nitric acid, and oxigenated muriatic acid in the 



ilate ufed for bleaching, preferved a moderate ftrong foup for 



feverai months. 



Lcverian Mufeum* 



Sale of the Le- The Leverian Mufeum which has been near 40 years in 

 terianMufeum. collecting at an expence of near 50,000/. will be fold by. 

 public auction in May 1806, unlefs an acceptable offer for the 

 purchafe of the whole be previoufly made. The (ale will 

 take place in the building which now contains the Mufeum^ 

 Catalogues are preparing with all Ipeed. 



