_Curling of Iodized Paper._--The difficulty which your correspondent C. E.
F. has met with, in iodizing paper according to DR. DIAMOND'S valuable and
simple process, may be easily obviated.
I experienced the same annoyance of "curling up" till it was suggested to
me to damp the paper previously to floating it. I have since always adopted
this expedient, and find it answer perfectly. The method I employ for
damping it is to leave it for a few hours previously to using it upon the
bricks in my cellar: and I have no doubt but that, if C. E. F. will try the
same plan, he will be equally satisfied with the result.