text:  Thinking of her husband in a state of reverie a morbid spectrum might be the result--distinct enough to cause her sudden alarm and exclamation which if the children heard (and children distinguish their mother's voice at a considerable distance--the cabin door too might have been open and the children much nearer than they were supposed to have been ) would account at once for their calling out 'Papa! papa!' During our waking hours we are never conscious of any complete suspension of thought even for a moment; if fatigued by any long and laborious mental exertion such as the solution of a complicated mathematical problem how is the weariness relieved? Not by listless rest like the tired body but by a change of subject--a change of action--a new train of thoughts and expressions