A man carries his personal trademark, not in his face only, but in his nervous system and muscles--giving rise to characteristic movements and gait; in his larynx--producing an individual voice; and even in his mouth, as shown by individual peculiarities of speech and accent.

And the individual nervous system, by means of these characteristic movements, transfers its peculiarities to inanimate objects that are the products of such movements; as we see in pictures, in carving, in musical execution and in handwriting.

No one has ever painted quite like Reynolds or Romney; no one has ever played exactly like Liszt or Paganini; the pictures or the sounds produced by them, were, so to speak, an extension of the physiognomy of the artist.

And so with handwriting.

A particular specimen is the product of a particular set of motor centres in an individual brain." "These are very interesting considerations, Thorndyke," I remarked; "but I don't quite see their present application.