Hiya Sue,
I think so too, I just want to get the terminology right. There is no doubt this is cased and one of Carlo Scarpa's developments seems to be just this cased pulegoso, which he called "sommerso a bollicine" (viz. Ursula Losch). So is this that treatment? And if so what is the difference between bollicine and pulegoso? Which both seem to be bubbly glass?