"The handwriting of any individual would be found to resemble the characteristic tracings shown by his pulse and respiration and fatigue curves. Nor is the interest in the variational aspect of handwriting restricted to recording the diversities in penmanship from individual to individual; it is also engaged in noting variations from day to day in the handwriting of any given person under the influence of fatigue or emotion or disease. But, however numerous, such observations and however legitimate the speculations they engender, it remains for the physiologist and the psychologist, with the aid perhaps of the sociologist, to compass the scientific study of the variational factor in handwriting."