By request of Mr. Fletcher I add a few remarks to his article in the January number on “Killing, Preserving and Relaxing Insects,” though the subject is so well treated there as to leave little room for additional comment.

The action of the cyanide bottle cannot be depended on as effectual in such a short time as Mr. Fletcher mentions, except in the case of the most tender insects, many Rhynchophora will live there for several hours unless the bottle is quite freshly prepared, and I know of one case in which a Coelocnemis remained alive all night confined in a bottle strong enough to quickly overcome the large southwestern species of Cleonus.