"In any case it is evident that there is a psychology as well as a sociology of handwriting. Tremendously complicated as the problem of diagnosis of individual traits from those tiny strokes of the pen appears, it is yet a legitimate problem of science; for the more progress psychology makes, the more evident it becomes that there is not a mode of expression which is not rooted to its finest detail in the complex psycho-physical organism. Meanwhile, it is fortunate that the task of identifying graphic signs should not be left wholly to the intuitions of the graphologist. Experimental work that seeks to induce variation in writing through a control of outer conditions must in time correlate certain definite variations in conditions with variation in such aspects of writing as size, speed, accuracy in alignment, inequality of control and the like."