jAA Scientific Ntwi. 



of dilatability in thefe fluids. For this application he avails himfelf of the experiments made 

 by Prieur, and publilhedby Guyton, on the diiatability of oxygene gas, azote, hydrogenous, 

 nitrous, carbonic acid, and ammoniacal gafcs ; and laftly, on the expanfive force of the va- 

 pour of water and that ol alcohol. 



This memoir contains tabk-s deduced from the equations aftorded by tlie methods made 

 ufe ot by the author, and the refults obtained by Prieur. They are likcvvifc cxprellcd by 

 engraved curves. 



It was formerly obferved, that fnow preferves the vegetative power, and that rain accele- 

 rates the growth of pLmts more than artificial waterings. Haflenfratz has enquired, in his 

 memoir, into the caufe of thefi; comparative effeas. He (liews, from fevcral experiments, 

 that the preferving power of fnow arifcs from two circumftances — its imperfe£l conducing 

 power, and its oxygenation. This philofopher has proved, that fnow is water oxygenated 

 and converted into the folid form. He has alfo fliewn, that rain is more oxygenated th.m any 

 other water, and that a large portion of its good effetls is to be attributed to this ciicum- 

 ftance. 



The memoir on the arts is written Ky CliaulTier. lis objc£l is to dcfcrib^: the cvnpofitioB 

 of a liquor proper to be fubftituted inftcad of wine lees in fulling, to obtain live grcatoft 

 eftei5t with the mod facility and economy. 



The liquor indicated by ChaulTier is a fmall quantity of fulphuric acid. This acid bath, 

 which experience has aflurcd him may be ufed with invariable fucccfs, likewife affords the 

 advantage of obtaining a very white colour in hats, becaufe the felt does not become co- 

 loured in the working. 



Extraa of a Letter from Profeffor LoRENZ DE CSELL. 



MR. KLAPROTH*is continuing his chemical analyfis.and will (hortly publifli a fecond 

 volume of them. He has found that the newly dlfcovered Titanium is by no means fo rare as 

 might be fuppofed from its not having been known till lately. He has detefted it in a fm- 

 gular kind of mineral found at Afchaffenberg by Prince Gallitzin, and in fome other mine- 

 rals, as well as in menakanite, in which it is mixed with iron. — Mr. Wcftrumb's method of 

 obtaining ardent fpirits from different forts of grain, proves to be excellent, and fucceeds 

 well on a large fcale as a branch of trade. — Sulphate of barytes does not require more than 

 an equal quantity of well aerated alkali for its decompofition both in the humid and dry way. 

 Muriate of barytes is obtained perfeftiy pure by boiling it in ten times its weight of highly 

 reftified alkohol vini, which diflolves nothing but this muriate.— To feparate hepatic gas 

 and carbonic acid gas when united, employ acidulated acetite of filver or mercury. Either 

 of thefe metallic falts will abforb the hepatic gas, and leave the carbonic acid gas un- 

 touched. 



• This article was forwarded to the learned editor of the Englilh tranllation of Crell's Journal ; from whom 

 I received it in a letter, containing very encouraging cxprefTions of approval and good wilhcs fur the fucccfs ui 

 rhe prefcnt '-'ndertaHng. 



