Bába Yagá. In Professor Sypherd’s studies on Chaucer’s House of Fame , Chaucer Society, 1904, a most valuable note will be found on revolving houses. It will be seen that the legend is cognate with magic wheels that revolve at great speed, or turn on wheels emitting flame and poison. The nearest analogy quoted is the whirling rampart in the Mael Duinn , but the Russian legend is evidently related and not derived.