What is the duty of an occupier or possessor of a premises in exercising care toward an invitee?

MACKENZIE, J.A.—In this action the plaintiff’s case is grounded solely on negligence. In entering upon the defendant’s street car, she was undoubtedly an invitee. The duty of the occupier or possessor of premises in exercising care toward an invitee is generally defined in the classic statement of Willes, J. in Indermaur v. Dames (1866) L.R. 1 C.P 274, at 288, 35 L.J.C.P. 184, as follows: And with respect to such a visitor, at least, we consider it settled law that he, using reasonable care on his own part for his own safety, is entitled to expect that the occupier shall on his part use reasonable care to prevent damage from unusual danger, which he knows or ought to know.