Hi, In message <1749074027.6281762.1308663814749.JavaMail.root@vznit170080>, arnold140@verizon.net writes > >Have a look at an infra-red image of a flowering Arum. >http://pacificbulbsociety.org/pbswiki/index.php/… Arnold, how did you take that photo? After the original discussion I looked for thermal cameras, and they're very expensive. I ended up at a site that gave instructions on how to turn a cheap infrared thermometer into a camera. (infrared cameras are common and cheap and not the same thing) -- David Pilling email: david@pilling.demon.co.uk web: http://www.davidpilling.net/ post: David Pilling, P.O. Box 22, Thornton-Cleveleys, Blackpool. FY5 1LR. UK