116 «FrECT »# OiLVANiSM IN MBTA*.Ll£J ARlJORIZATlOifS. 



late that which is in ftoluiion; dnd the oxigeiV) ^ rwbich it 

 18 divested, remained in the liquid, to be gradually con- 

 veyed to the precipitant metal; the pavtick'B of tin ought 

 <tD continue to be deposited on c d, as wh«n this part was 

 in contact with the iinc. Bat as no effect takes place, 

 after this contact is broken off, this hypothesis is as un- 

 founded as the preceding. 

 A contact of This simple experiment clearly demonstrates, that the 

 metals ejsen- raetal in solution cannot continue to deposit itself on the 

 ' extremities of the arborization c rf, unless this communi- 



cates at some point with the metal 2, which acis as the pr,t- 

 which excited ci pi tan t. But it is well known* that such a contact of 4^*o 



a current of metals is sufficient, to give nt«e to a current of culvanic 

 electricity. . . ' o _ ... 



electricity; and that the elfects of this electricity are iden- 

 tical with those observed in the precipitation of p^^.jfietal 

 by another: here then we have one proof, that this phe- 

 nomenon depends on a similar cause. Thefoljowing ex- 

 "t|i|jriment8 fully confirm this conclufion. ,J'\^^ iiojhHo;^ ik 

 Farther expe-^ Sect* IV. I filled half a tube six inches high, and a little 

 rimentsto more than a quarter of an inch in diameter, with a con<eii- 

 ^ '* trated solution of nitrate of copper. Into the other half 

 i poured very gently a solution, not ver|V.4ens^»; of pyre 

 and perfectly neutral crystallized |iHi?At|J <5t,f,fii|yer. , n^ith 

 tiie latter I had mixed a little alcohol, to diminish its spe- 

 . :cific gravity; and thus I was enabled to place the two li- 

 -v-j^uids in contact without mingling them. That in the lower 

 ..part of the tube was of a tine blue colour; that above was 

 Arborizationi sclear and colourless. In the middle of the latter, that is 

 ofAilyjer , ,^. about an inch and half down the tube, I placed a small 

 * ^ i-> ;,^;^ylinder of copper, which, soon began to precipitate me- 

 -Jsm ow: ic l^liJc silver in the form of very delicate and fine garli^nds. 

 "w«u lliV/ ,;,,jThese chains of silver flowers gradually approached the 

 blue solution of copper, and, in twenty-four hours after 

 '•SDiipped with they had reached it, I had the agreeable surprisje Jo see 

 ^daopper« .ii' >;>;their extremities covered with particles of copper, the.co- 



Uloi at iSlsm „, _ r- i • l r t , • . 1 IJ .. 



i bluori* noif ;!our ot which was pertectiy aistmct, so that tliey could, not 



ci£jKi>:>t,iq i;^ confounded With those of silver^ Th« tree of Diana, 



.,^^l>jch ij^ |;pis experiment appeared to have been trans- 



-: i<|riafli^4 AntOf,the garden QjiVtlieflespe^^^ accjtiited in 



four- dayajtiredocj'easg x>f a qi^artej ^f .«4V WH*h>vtl^,^M)lour 



. and 



