1930 
June 5 
4EM0R &HD0M FOR DOCTOR BELL 
Tbe regular skin cases in the Biological survey coa-i^i-iuii b^wau 
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 treat- 
ed more often, hew material should be thorouglily treated before being 
put away in permanent storage . 
Tanned skins in the hanging room should be thoroughly iumigated 
with hydrocyanic aeid gas once a year or oftener, aid paraclde uses 
plentifully between fumigations. The skins should be spaced so tiie gas 
thorn anti r-Afic.h stotv oart of the specimens. If they 
Vernon Bailey , 
Chief Field naturalist 
