This is a most stimulating contribution to the literature of what has long been a nebulous branch of constitutional law. Few departments of the law exhibit more clearly the flexibility of the constitution, its adaptability to changing economic conditions and the resulting difficulty of forecasting constitutional decisions, than that of foreign corporations. But the greatest factor contributing to uncertainty and anomaly in this branch of the law has been the unfortunate confusion in the theory of the corporation. Curiously enough, by piling fiction upon fiction, some measure of justice has now been worked out by treating the corporation as a person or a person within the jurisdiction under the Fourteenth Amendment. Not even yet have the...