Instead of the negative instruction, _i. e._, telling what not to do,
teach a positive lesson; let one pupil impersonate a lame man; have
several pupils or all of them rushing past him; let some one or two
offer to pilot him across the “street,” which may be marked off on the
floor. In discussing the matter, if discussion seems needful, assume
that all of the pupils really want to be courteous and kind but forget
it in their haste.