Daguerreotyping in London.—In a recent letter from J. E. Mayall, dated London, February 11th, he writes in his postscript:—"While I write this letter we have the gas lighted in the streets—1 o'clock P.M., and I write by gas-light."
We must confess that the Daguerreotypists are in the "Fog" enough in this country, but if "Old Sol" should get blocked up at that early hour, we don't know what would become of our "Foggy" Daguerreotypists here.
The ground side of the "Ground Glass" should face the lenses.
Mercury baths should always be kept covered with some porous wood, in order that the mercurial vapors cannot escape in the room.