But this he gave up as a vain task; and he sent more slides of soil down upon the scene of his labor, until no sign remained of the out-jutting walls of the vein.
Но он скоро бросил эту затею и все сыпал и сыпал землю, пока от выступающих краев жилы не осталось и следа.
Execute the insert repeatedly until no rows are inserted.