Hi, Bronze Mantella Keeper

[deranged chipmunk]

The item you are talking about is called a wardian case. They were very popular terrariums at the turn of the 20th century. They are starting to gain popularity again. You should be able to find one at a decent price nowadays. And I agree, small tanks are fun, but more of a challenge. At least as far as aquatics go. I've built numerous nano tanks. All the way down to less that a gallon.

[FishChum]

Wowzers you know your stuff! I think it would be a fun challenge, as you say, keeping a pair of frogs in a wardian case. moving it into warmer spots on cool days and to the window for light when weather permits, tiny bits of misting, trimming plant in a sorta bonzi fashion. little moss and some nice landscaping. sounds very steampunk-ish as well. could even use an old aspirator and other antique looking equipment, thermometer and such to have the whole package. sounds cool!