mixtion (mikschon)

[Formerly mistion; Others, perceiving this rule to fall short, have pieced it out by the mixtion of vacuity among bodies, believing it is that which makes one rarer than another. Sir K. Digby, Nature of Bodies. 2. Among French artists, a mixture of amber, mastic, and asphaltum used as a medium or mordant for affixing leaf-gold to wood or distemper pictures.