Important and interesting facts have been brought to the attention of the medical world as a result of investigation into the functions of the ductless glands. It is to the correlation of these facts that we must look for a satisfactory understanding of the part played by these glands in the regulation and maintenance of life. The difficulties of research have been so many and the establishment of facts so gradual that progress in our knowledge of these glands has seemed slow. At present, however, there has accumulated a sufficient number of observations to render it probable that some insight into the workings of these obscure glands might result from an attempt to unify the isolated facts.
This work of unification has been very well begun by members of the Vienna school. They have pointed out the striking fact that, beside their own specific action, the ductless glands interact among