There is a good book I own - Winter Flowers in the Sun-heated Pit by Kathryn S Taylor and Edith W Gregg, published by Charles Scribner’s Sons in 1941. I also read another book which I read, but don’t own. Called something like “the chicken-heated greenhouse”, I think. It was a solar greenhouse/chicken house combo, and was warm enough to grow winter tomatoes commercially. The woman also tried to get some other animals to stay in it (sheep?) but they found it too warm so refused. This was on the East coast and worked there, but would never work out here in the West as we seldom see the sun in winter. Diane Whitehead Victoria, British Columbia, Canada cool mediterranean climate warm dry summers, mild wet winters 70 cm rain, sandy soil _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>