The prominence of affections of the lungs in various diseases, either as complications or primary elements, gives this organ perhaps a higher importance than any other organ in the body. The emphasis given to tuberculosis is not the result of a mere scare, nor is the fear of it to be characterized as a simple "phthisiophobia" without sufficient foundation. Statistics show the danger only too plainly and until specifics are obtained for the cure of the various diseases the human race must resort to prophylaxis as its chief means of rescue. Even when cure is accomplished the result is obtained by attention to the individual as well as to the causative germ or agent. It is not the intention of this article to discuss the degree to which pulmonary diseases are infectious, contagious or communicable but, accepting the fact that the lungs are a fertile field for the cultivation and