In short, the remedy combined chlorinc, as lead one to suppose, but chloric acid or common

advocated by Dr. D'Rosario is not unin some portions of his letter, he would chlorine in combination either as hydrosalt. I am,

Sir,

Yours

faithfully,

Civil Surgeon.

OUDH, September 20th, 1875.

DISINFECTANT TREATMENT OF CHOLERA. TO THE EDITOR OF THE

"

INDIAN MEDICAL

GAZETTE."

Sir,?In reading Honorary Surgeon-Major D'Rozario's letter on the above subject in your issue of September 1st, 1875, I observed that mention of one substance necessary for making chlorine was omitted, perhaps inadvertently, viz., Black Oxide of

Manganese.

If Black Oxide of Manganese were not employed the gas produced would be hydrochloric acid and not chlorine. Thus: 2 Na. 01. + H2 So4 = Na? So4 + 2 IICl. Perhaps Mr. D'Rozario will kindly explain so as to clear up all doubt on the matter. If hydrochloric acid were the substance produced the draught would be :?

& Acidi Hydrochlorici c aqua Sodaj Carb Tinct. Opii ...

...

...

M|

(strength ?)

...

...

...

...

...

... ... ...

ji. ^x.

M. Ft. Haust. It is obvious that the result of mixing these ingredients would be effervescence of carbonic acid and formation of chloride of sodium, a substance which we always have at hand without splitting it up and again recombining its component parts. The fumes produced by throwing common salt on a fire do not consist of chlorine, but of chloride of sodium, which volatilises at a high temperature unchanged.

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