Source : Webster's Revised Unabridged Dictionary (1913)

Mitis casting \Mi"tis cast`ing\ [Perh. fr. L. mitis mild.]
   A process, invented by P. Ostberg, for producing malleable
   iron castings by melting wrought iron, to which from 0.05 to
   0.1 per cent of aluminium is added to lower the melting
   point, usually in a petroleum furnace, keeping the molten
   metal at the bubbling point until it becomes quiet, and then
   pouring the molten metal into a mold lined with a special
   mixture consisting essentially of molasses and ground burnt
   fire clay; also, a casting made by this process; -- called
   also {wrought-iron casting}.