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June 5, 1930.

[[underline]] MEMORANDUM FOR DOCTOR BELL [[/underline]]

[[underline]] Re: [[/underline]] Care of Biological Survey Collection.

The regular skin cases in the Biological Survey collection should be treated with carbon bisulphide at intervals of not over three months. Those in regular use or where new specimens are held up should be treated more often. New material should be thoroughly treated before being put away in permanent storage.

Tanned skins in the hanging room should be thoroughly fumigated with hydrocyanic acid gas once a year or oftener, and paracide used plentifully between fumigations. The skins should be spaced so the gas can penetrate among them and reach every part of the specimens. If they are too closely packed together the gas cannot penetrate and the moths are not all killed.  Before fumigating the room the skins should be brushed and all loose hairs and dust removed and the floor swept so any trace of moth work can be recognized. When fresh moth work is found the specimens should at once be fumigated or treated with bisulphide.
   
Vernon Bailey,
Chief Field Naturalist.

VB/ers

Transcription Notes:
edited for consistent style -@meg_shuler