These vesicles, being due to the bubbles of vapour that gathered in the molten rock, usually occur in greatest abundance towards the upper surface of a bed of lava.
"Geology"
James Geikie
Sometimes he was so absent that he did not hear our questions, but apparently absorbed in his own thoughts gazed at the wine-bubbles in his glass, or holding a lump of ice to the candle watched it slowly melting.
"The Dead Lake and Other Tales"
Paul Heyse
Most certainly there can be no great poetry where the sentimentalism is forced, where it becomes ridiculous, where it bubbles over and becomes monotonous.
"The Literature of Ecstasy"
Albert Mordell