_Mode of exciting Calotype Paper._--I forgot inserting this plan of
exciting in my paper: it is very clean and convenient, simple and sure.
Obtain a piece of plate glass, two or three inches larger than your paper,
level it on a table with a few bits of wood, pour on it your exciting
mixture (say aceto-nitrate and gallic acid, solution of each 20 minims,
distilled water 1 ounce), and spread it evenly over with a scrap of
blotting-paper. Float your paper two minutes, remove and blot off; this
ensures perfect evenness, especially if the paper is large. You may thus
excite half a dozen papers with little more trouble than one.