What is ordinary, or reasonable skill, [59].

Amount required, [59]–[62].

— — varies, [60], [61].

Liability if skill not applied, [62].

Skill and diligence must be joined, [63].

School considered in determining, [64].

Proof of skill, [64].

Required in non-professional, [64], [65].

— — volunteer, [65].

— — gratuitous services, [65], [66].