>> I also learned that auto N02 always contains H2S which is a very 
toxic gas
 > >to humans.  I wonder about bees.

I posted that before researching further.  Apologies.  I should probably 
have
corrected that.  Seems other sites say SO2 and others yet other things.  
I think
one suggested it is reasonably pure.   At this point, I just don't 
know.  After all,
I did my research on the Internet where anyone can write anything and if 
it is
unlikely enough, it gets repeated and repeated.

( For all I know someone is now writing an article for a 'science' or
'environmentalist' magazine or proposing legislation citing my previous 
erroneous
comments (now withdrawn) which were based on a website written by somebody
with a car (if he/she is 16 and not a dog or a 'bot') and an imagination 
-- or possible
brain damage from inhaling automotive N2O while choking.

 > Have you considered the nitrous oxide chargers used in seltzer 
bottles?  I
 > assume they don't contain toxic additives.

The legality of purer N2O sales in quantities of any size to  the 
general public
(laypeople) seems to vary from jurisdiction to jurisdiction.  I have not 
checked
here in Alberta.  It would be a real laugh if we can just go down to 
Aire Liquide
and buy a 100 lb bottle.

There are also tiny charges which apparently are available at Wal-Mart
and other stores and which are freely available to the general public.
I had discounted them since I assumed that they contain too little to be 
useful
since the 'net druggies seem to think they are too small for just one to 
produce a
decent 'hit'.  I figured I'd need a truckload to do several hives, and 
I'd have to
figure out how to apply them.

I really should write a short article on what I learned, but I probably 
won't until
I try the method described by Juanse and for which I bought supplies and 
decide
if it is something I need to refine.

I also highly respect Jerry's opinion and am waiting for any further 
info to surface.
I understood him to be saying that work had been published on the use of 
N20 and
am hoping that either he or others (Pete?) with good access to database 
searches and
the results will post a synopsis of the risks for us lay beekeepers.

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