^.Q ACIDS BY GALVANISM. 



crowned wifh ancient firs, and of frightful precipices formed 

 by the burfting of the locks and banks, which the fury of the 

 Ru'ins of locks water has overturned. Thefe laft were conftrufted in the bed 

 which had been ^f (i,g cafarads, in order to render the river navigable through 

 ftniaed in the >'« whole length ; but this daring work of man could not refift 

 bed of the cata- the reiterated CiTorts of nature, and therefore it was necellary to 



have recourfe to another plan. 

 The canal paffes The canal newly conlirofled patTes by the fide of the cata- 

 by the fide of radls, and its bed is partly formed in the natural rock, and 

 Is'pardy^utin partly in amarfliy foil. It was began in 1794, and finifhed at 

 the rock. the end of fix years, in 1800. Its breadth is 22 feet, and its 



dcptCnumber depth fix feet and an half. Its locks are eight in number, and 

 of locks, time its coft amoun(ed to the fum of 598^3 pounds fterling, which 

 of excavation, ^^^ colleaed by fubfcription. By means of this canal there 

 and coft. j f j • <• i 



The extent of is a continued navigation, without any interruption, from tlie 



'ndT'?'"of province of Wermeland to Gothemberg. In 1802 the number 

 •veflels which of vetTels which had pafied this canal amounted to 138Q, which 

 haw paffed, is at the rate of 1 1 90 each year. 



- vrii. . 



Letter from H. B. K. on the ProduBion of Nitrons Acid,, awi 

 oilier FaSis*', 



To Mr. NICHOLSON, 

 SIR, 



Ixperlments /\s Mr. Accum has not anfwered. my paper, he therefore 

 Carbonate of knows of no experiments which (hew the formation of the 

 potafhin water nitrous acid ; but anxioufly imprefiied with the fubjed, Ihave 

 smdemkud^^ ' ^^^^ performing fome experiments, which I think will throw 

 carbonic gas. great light upon the caule of the nitrous acid appearing in 



eledrical experiments. 

 The potath be- I pafTed the galvanic fluid through a watery folution of the 

 came capable of carbonate of polafii, made by diftiUed water, confined in a 



ocfiigiation like . ■' 



nitre; and folu- glafs tube where no atmofpherica! air could have accefs to 



«°" '^^ ^''^^'^ •'» and I found a great produ6lion of air come from the folu-- 

 ftcwed the pre- . , . , ^ . . 



fence of muria- '^'on, which upon exammation was pure carbonated air ; and 

 tic acid. 



* See our Journal, X. 106, 214, and XI. 105. 



then 



