134 SCIENTIFIC NEyy\'S. 



Its properties, the long a6|ion of water, or cold oxigenated muriatic acid. 

 This appears friable and pulverulent. It has loft almoft all 

 its latent heat. It is very little inflammable, and does not 

 attrafl the moifture of the air. It is acidifiable only by the 

 intimate adion of an oxigen that contains caloric highly con- 

 denfed, as that of the nitric acid. In a word, it is phofphoru? 

 at a maximum of oxidation. 



Regular Cri/Jiallization of EJftntial Oil of Rofes, 

 Jlegolar cryftal- Citizen Steinacher has lately obferved this with atten- 

 lizatijnofoilof |joj^_ He mixed eight kilogrammes of the magna of da- 

 mafk rofes {rofes pales) with fome parts of water, according 

 to the procefs of Cit. Demachy ; and after a day's macera- 

 tion he drew off' by diftiUation (ixteen kilogrammes of water. 

 This was immediately poured into a large glafs jar, which was 

 covered with a cloth, and left at reft. In twenty-four hours 

 he found the furface of the water covered with an iridefcent 

 Refenjbles the pellicle, interfperfed with little hexhaedrons, very much re- 

 cryftalsoffnow, fembling the cryftals of fnow, which the iUuftrious Cit.' 

 Monge has defcribed. He informs us, that a flight ftiake is 

 flnd requires ab- fiifficient to tear the cryftalline gauze, and reduce it to that 

 folute repofe, irregular form of whitifti fcales or laminae, which the oil of 

 rofes commonly aflumes. 



SCIENTIFIC NEWS. 



ExtraSl qf a Letter from Dr. Schaub to Mr. Parkinson, 

 dated Cajfel^ July 2, 1803. 



1 AM buft^y employed in the analyfis of various minerals, 

 the refults of which I fliall communicate to you in my next. 

 I have noticed among other things alfo, that the metal called 

 Tungftennot tungften (Wolfram by the Germans) can only be obtained at 

 the higheft degree of de-oxidation, and that this metal does 

 not belong to the clafs of aciditiable metals ; for tungften 

 cannot be oxidized by means of common procefles of oxida- 



New method of '. ,.-. , ^ •, r t • ■ ^ 



obtaining pure * "^^^ dilcovered a new method of obtaming pruflic acid, in 

 pruflic acid. a ftate of abfolute purity. This procefs confifts in pouring upoij 

 one part of pruffian blue, half apart of fulphuric acid, diluted 



3 with 



