I can endorse (not necessary, of course) Mr. Mead's “Notes on Collecting,” pub. p. 78, vol. 5 of the “Entomologist,” with right good will, having used similar methods myself for several years. I think I got my idea from H. Guard Knaggs.

A little improvement, However, may be made. If the collector, instead of putting in his “Cyanide of Potassinm” in “lumps,” will pound it to a fine powder, intimately mix it with the necessary amount of Plaster of Paris, and then pour in water till the mixture has by stirring assumed the consistency of cream, he will have a more efficacious, as well as a more lasting box (or bottle).