Help: Dros. Anesthesia?

[amicus constantini]

In article <333953A8.E31 at pkgconsult.com>, "J. Pflum"
<jpflumjr at pkgconsult.com> wrote:

>Is there any way to make home-made anesthesia (sp?)?  I have tried
>putting the flies in the refridgerator but they do not stay dormant for
>very long.  Thanks.  
>-- 
>
What about using dry ice.  Not for the cold, but for the CO2.  let it
sublimate to gaseous CO2, and put the flies on a pourous plate above the dry
ice.  Far enough away so they don't freeze.