um simples promotor de combustao.

Berzelius hé

quasi o unico chimico, que ainda sustenta a antiga opiniao: e esta sua opposiçao procede de elle considerar a theoria de Davy incompativel com os seos canones chimicos que estabeleceo por meio de exactissimas analizes: julgamos porem, que se Berzelius examinar este assumpto com maior attençao, verá que tal incompatibilidade nao tem fundamento algum. Se este fosse o lugar proprio, e tivessemos campo para isso, parece-nos que poderiamos mostrar, que a doutrina de Davy e os canones de Berzelius nao se contrariaō por forma alguma.

No Jornal de Schweigger de Maio 1815 (vol. xIII. pag. 72) vem uma memoria escripta pelo Professor Hildebrandt, em que propoem varias objecçoens á theoria de chlorine suggerida por Sir H. Davy. Muito nos admiramos lendo este papel ver, que todas as objecçoens, que elle continha, já há muito haviaō sido examinadas, e respondidas; e que todas ellas estavao fundadas sobre principios falsos. Chlorine, diz Hildebrandt, converte o gaz nitroso em acido nitrico, e por comseguinte deve conter oxygenio. Ora foi esta experiencia feita neste paiz pouco depois de Davy publicar a sua theoria; e com effeito se observou que tal mudanca occorrera; examinando-se porem o gaz chlorine, estava este misturado com ar atmosferico; e preparando-se depois chlorine puro achou-se, que o gaz nitroso nenhuma mudança havia experimentado: Davy tambem fez esta mesma experiencia, e publicou o seo resultado; e nao há chimico algum neste paiz que nao esteja sciente deste facto. A outra objecçao hé que sendo o sal commum decomposto pela bataria galvanica o chlorine apparece no fio metallico positivo. Isto longe de ser uma objecçao, hé antes um forte argumento á favor da theoria de Davy; pois se o oxygenio e chlorine, que sao simples promotores de combustao, sao ambos attrahidos pelo polo positivo; logo o chlorine, sendo um simples promotor de combustao deve tambem ser attrahido para o mesmo polo. A outra objecçao hé que ardendo os metaes em gaz chlorine, sao convertidos em oxides. Tal nao acontece, excepto quando há agua no vaso, em que hé feita a experiencia; se o gaz chlorine hé puro, os

metaes sao transformados em chlorides, dos quaes o Dr. Joao Davy tem descripto varias especies. Quanto as outras objecçoens, ellas sao da mesma natureza, e pouco dignas de se mencionarem, em razão de haverem sido há muito refutadas.

(Continuar-se-há.)

LISTA

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VOL. XV.

30