You are taken sick; you send for a physician; he comes in, stays ten minutes, prescribes for you a healing medicine, and charges you three or four dollars. You call this 'extortionate' - forgetting the medical books he must have waded through, the revolting dissections he must have witnessed and participated in, and the medical lectures he must have digested, to have enabled him to pronounce on your case so summarily and satisfactorily.