it sometimes perhaps seems to be made up; to suggest that, especially when studied in relation to other branches of biology, it is capable of becoming a guide in the actual affairs of life and of giving an understanding of the human mind such as may enable us in a practical and useful way to foretell some of the course of human behaviour. The present state of public affairs gives an excellent chance for testing the truth of this suggestion, and adds to the interest of the experiment the strong incentive of an urgent national peril.
If this war is becoming, as it obviously is, daily more and more completely a contest of moral forces, some really deep understanding of the nature and sources of national morale must be at least as important a source of strength as the technical knowledge of the military engineer and the maker of cannon. One is apt to suppose that the chief function of a sound morale is the maintenance of {7} a high courage and resolution through the ups and downs of warfare. In a nation whose actual independence and existence are threatened from without such qualities may be taken for granted and may be present when the general moral forces are seriously disordered. A satisfactory morale gives something much more difficult to attain. It gives smoothness of working, energy and enterprise to the whole national machine, while from the individual it ensures the maximal outflow of effort with a minimal interference from such egoistic passions as anxiety, impatience, and discontent. A practical psychology would define these functions and indicate means by which they are to be called into activity.
The more we consider the conduct of government in warfare the clearer does it become that every act of authority produces effects in two distinct fields—that of its primary function as directed more or less immediately against the enemy, and that of its secondary action upon the morale of the nation. The first of these two constituents possesses the uncertainty of all military enterprises, and its success or failure cannot be foretold; the influence of the second constituent is susceptible of definition and