Christmas Cactus Blooming

[Barry Mercer]

I enjoy Cacti... don't know much about them, but I enjoy them. (my 
spouce doesn't)  How do I encourage these things to bloom and just how 
dry should I let them be before I water.  The Christmas cactus I water 
once a week the "real" cacti far less frequesntly.

I recently read that keeping them very dark and very cool at night will 
help.  Aside from the christmas variety of succulent (sp?) I have the 
"living stones" (without Mick) and your store bought types with lots of 
needles. 

Thanks for any replies

Barry