Note (return) — PHOTOGRAPHIC CORRESPONDENCE.

As to details, the prints of the mice (p. 46.) and the cat (p. 37.) are from a glass coated with iodized collodion rendered sensitive, exposed to faint light for a short time and developed. In this method, the glass should be heated; and the collodion burnished with the hand, to make it adhere well.[5] The owl (p. 22.) and the stork (p. 10.) are from a glass coated with iodized collodion "rendered sensitive" only, and not developed so as to be only semi-opaque. On this high lights were put with opaque white, and darks were etched out. This has the effect of a tinted lithograph, but requires much more care in printing than the former method, in order to hit the right tint; so much so, that I have usually printed the stork faintly so as not to show the "tint" at all. The frontispiece is from a paper negative, a method much more troublesome and tedious than either of the others, both in preparation of the negative and in printing.