In what circumstances will a jury or jury decide an action against a doctor?

In Town v. Archer (1902), 4 O.L.R. 383, Falconbridge C.J.O. said at p. 389, dealing with an action against a doctor: “Actions of this kind were, as a matter of course, formerly tried, both here and in England, by a jury; and it was the almost inevitable result that juries, perhaps innocently and unconsciously, looked more favourably upon the case presented by the patient than on that presented by the physician or surgeon. To remedy this condition of affairs, and not to leave doctors entirely at the mercy of juries, the courts in this country early became astute to lay down limitations and restrictions on the actions of the twelve; or, rather as to what matters ought to be left to them to deal with.”