ABSTRACT
In embarking upon the experiment in depth one somewhat bewildering characteristic of human nature needs particularly to be taken into account. Anyone who has observed his fellow-beings at all closely will have noticed how people of ability, while showing marked strength in some directions, often reveal an almost incredible weakness in others. Thus, a man of proved scientific acumen is Hable, perhaps, to behave like an adolescent in matters of the heart. A person of great practical sense may prove completely devoid of imagination. A genius in philosophy may be capable of missing his way a few yards from his own front door. An orator, able to move great audiences with his eloquence, becomes confused, it may be, when confronted with a few figures. As the French put it, everyone has les défauts de ses qualités; and, it would often seem, the greater the qualités the more abysmal the défauts.
