Scaphism?

[zellerzone]

from an old woodcut

[zellerzone]

A nineteenth century traveler in China mentioned in passing

"the man in the tub containing earth and quicklime, his head and hands protruding"

and noted parenthetically;

"the victim of this torture usually takes about three days to die"

[zellerzone]

A possible illustration of the "tub containing earth and quicklime". The caption is probably in error.