The science of medicine has for its purpose not only the cure of disease, but, infinitely more important, the prevention of sickness and of suffering. Students of the medical profession—and, as long as we are faithful to our calling, we who are known as medical doctors must also be students—investigate matters pertaining to prevention and cure in every direction. To one the ability is given to contribute books of instruction; to another records for reference; to others instruments for operative surgery, instruments for diagnosis, appliances for deformities, apparatus for the relief of the injured, appliances to protect against deadly pestilence, and the simpler articles to aid in general hygiene. There are many workers, and much material offered for inspection which must prove worthless and useless. From the great gathering of the efforts of thousands some things prove of value and are accepted and are permitted to do useful and honorable service.