I either read or heard somewhere
that cats will purr when they want attention, meaning that a purring
cat doesn't necessarily mean that it's contented (cats will sometimes
purr if they're in extreme pain).

 
   I imagine that the younger kats--toddler kittens, beneath speaking
age--probably purr more often then adults, for no other reason than it
seems to fit.

Dr. Jake Clawson
(djclawson@garden.net)
(XXRJ13C@prodigy.com)