Have I omitted any necessary addition? or have I proceeded wrongly?—I am, yours, &c.,
Ammonia Fuming.
Leeds, January 29, 1872.
A CORRECTION.
To the Editors.
Gentlemen,—In my communication to the Journal last week, at page 37, under heading Using the Substratum, there is an omission which would prevent the successful coating of the plates.
The strength of the albumen there given is that of the stock solution, to use which add two ounces of distilled water to every half-drachm required, half-a-drachm thus diluted being amply sufficient to coat fifty plates.—I am, yours, &c.,
Aleck. A. Inglis.
Edinburgh, January 30, 1872.