Great post Peter, I found it quite interesting. I contacted Marla about the propolis envelope and got a quick reply back. If brood boxes simply have a rough finish like unplanned wood the bees will make a propolis envelope. Peter maybe you have easy access to her paper on propolis and honeybee immune system I think she published recently. I know she has grad students working on various research projects concerning propolis and its benefits to humans and honeybees. *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm