ISi SCtEWTinC NIWS. 



fi^elatine. Mr. C. does not agree with Mr. Hatchet, their 

 discoverer, in considering them as similar to tannin. Re 

 thinks they differ not only from tannin, but from each 

 other; and that their diifferences arise from the acid em- 

 ployed, the matter from which they are prepared, and the 

 quantity of acid that enters into their decomposition. 

 Sulph. acid •^•** ^' ^^^ likewise examined the different compounds 



ftnd camphor, formed by the action of sulphuric acid on camphor. 

 DbtiUation of Not a year passes without presenting us with some happy 

 •J*"**** application of chemistry to the arts, and thus affording us 



fresh proofs of the .benefit, that our manufactories derive 

 from the sciences. Thus Mr, Chaptal has made some inter- 

 esting observations on the distillation of wine. The im* 

 provenient of this process has gone band in hand with that 

 of chemistry. One of the principal distilleries in the South 

 ' of France is nothing more than Woulfe's appar.itus on a 



large scale. 

 Ancient co- '^^^ same gentleman has analysed seven specimens of co* 



lours. lours found at Ponipeia. 



iStucco, & c. 



Mr. Sage has examined the processes best adapted to 

 the management of lime for making solid mortars ; the na- 

 ture of different kinds of stucco ; the means of giving the 

 polish of marble to artificial stones ; and lastly a process for 

 reducing white wax to a soap. 

 Zinc for roofs ^^ ^^^ ^^^^ written a paper, and Messrs. Guyton and 

 Vauquelin a report, on the advantages and disadvantages 

 of rooting houses with zinc. 



... , The section of chemistry have also pointed out, at the 



Jn-jurious ma- , *^ .... 



Dufactories. desire of the minister, what manufactures may be injurioos 



to those who live in the neighbourhood ; and what measures 



should be adopted, to reconcile the interests of the manu- 



•fectures with those of the public^ 



A report has also been made on a paper of Mr. Tarry*s 



indelible writ- \ . , . ^ c .- '\ 



ixM ink. respecting the composition and improvement ot writing ink. 



The author has composed an ink, which is not destructible: 

 ^ either by acids or alkalis; a great advantage in France, 



where the practice of altering title deeds has lately been 



very prevalent. It has the inconvenience however of letting 



fall its colouring m:>tter too easily, 

 Artificial tui- Another report^ oa the artificial turquoises of Mr. Sauviac, 

 (^uuises. gives 



