_Camera for Out-door Operations._--I should be glad to see a clear
description of a camera so constructed as to supersede the necessity for a
dark room. Such a description has been promised by DR. DIAMOND (Vol. vi.,
p. 277.); and if he could be induced to furnish it at an early period, I at
least, amongst the readers of "N. & Q.," should feel much additionally
indebted to him.