M. ChladnVs clavi- cylinder, SI 5 



fusion as above described, a portion of ihe earthy and nie- 

 tallic salts, with which it n.av be contaminated, will be 

 precipitated, and the purer muriate may be separated as 

 already described. . ... 



The nuiriale oF soda left mixed with the precipitated re- 

 siduum, is afterwards recovered by solution and evapo- 



Salt so obtained, t7)av be refined by inc modes usually 

 practi-ed with rock salt, viz. solution, deposition, and 

 evaporation ; and salt so refined will (say the patentees) 

 be purer and more lit for curing tish, and provisions tor 

 common use, than anv small salt at present manutaeuired, 

 and may supersede the necessity ot importuig foieign or 

 bay salt altogether. 



M. Chladni, so well known for his various researches in 

 the science of acoustics, has invented anew musical mstru- 

 ment, to which he gives the name of clavi-cylmdcr. The 

 imperial conservatory of music at Pans have made a very 

 favourable report on' the subject of M. Chladni's mvention, 

 which they describe as resembling the flute and clarionet ni 

 the hioh notes, and the bassoon in the lower keys. The 

 report^candidly states, that the clavi- cylinder is not so well 

 adapted for lively strains as for solemn music ; but Us elkcts 

 ui the urescendo and dimi/nu-mlo are highly praised. 



M. Chladni himself describes his mveulion m the lol- 

 Ujv ing ternis : " The clavi-cylinder contains a set ot keys, 

 and behind this a glass cylinder seven centimetres in di- 

 ameter, which IS turned by means ot a peual and a loaded 

 wheel. This cylinder is not the sounding body, but it 

 produces the sound by friction on the interior mechanism. 

 The sounds may be prolonged at pleasure, with all the 

 shades of oresctndo and dlmhiuevdo, in [yoponion as the 

 pressure ou the ke^s is increased or diminished. 'I'his m- 

 etrument is never out of tune. It contains lour octaves and 

 A half, from ut, the lowest in the harnsicord, up iaja. 



Wdliam Jackson Hooker, esq., F.L.S., of Norwich, 

 has lately returned from Iceland, where he spent the sum- 

 mer in uivestigatine: the natural history ot that interesting 

 country. He travdTed with a retinue of Icelanders as tar up 

 the country as ihc pcieimial snow would permit, eolleclmg 

 numerous specimens of quadrupeds, birds, insects, planlii, 

 minerals, kc, makini^ .Irawinsrs of the most important 

 obiects of curiosity, and also puicliasing, ni di^lU.reut places, 



■' ' many 



