The usual way to learn about diseases is to take up individual cases and to determine what specific matters stand out in the experiment of nature, and what special things shall be formulated into a plan of treatment or management.
When a whole field like that of psychiatry and its legal aspects in criminal cases is to be the starting point, one likes to take for granted a considerable experience with specific cases of the disorders to be subjected to such a special inquiry. But I do believe that even a general discussion of the general topic is bound to throw some light on how to become better acquainted with such a class of people as the insane.
At the very outset the problem appears rather different tothe physician from what it appears to-day to the layman. The layman, and I am afraid most lawyers, consider insanity as a condition
MEYER A. THE PROBLEMS OF THE PHYSICIAN CONCERNING THE CRIMINAL INSANE AND BORDERLAND CASES. JAMA. 1910;LIV(24):1930-1935. doi:10.1001/jama.1910.02550500016006