Finally, inquiries of a physiological nature into the reflex action of the body, and especially into general and specific sensibility, and sensibility to pain, and into reflex action under external agencies, conducted with the aid of instruments which record the results, have shown abnormal conditions, all tending to physical insensibility, deep-seated and <p 9>more or less absolute, but incontestably different in kind from that which obtains amongst the average men of the same social classes. These are organic conditions, it must be at once affirmed, which account as nothing else can for the undeniable fact of the hereditary transmission of tendencies to crime, as well as of predisposition to insanity, to suicide, and to other forms of degeneration. The second division of criminal anthropology, which is by far the more important, with a more direct influence upon criminal sociology, is the psychological study of the criminal. This recognition of its greater importance does not prevent our critics from concentrating their attack upon the organic characterisation of criminals, in oblivion of the psychological characterisation, which even in Lombroso's book occupies the larger part of the text.[4] [4] A recent example of this infatuation amongst one-sided, and therefore ineffectual critics is the work of Colajanni, ``Socialism and Criminal Sociology,'' Catania, 1889. In the first volume, which is devoted to criminal anthropology, out of four hundred pages of argumentative criticism (which does not prevent the author from taking our most fundamental conclusions on the anthropological classification of criminals, and on crime, as phenomena of psychical atavism), there are only six pages, 227- 232, for the criticism of psychological types. Criminal psychology presents us with the characteristics which may be called specially descriptive, such as the slang, the handwriting, the secret symbols, the literature and art of the criminal; and on the other hand it makes known to us the characteristics which, in combination with organic abnormality, account for the development of crime in the individual. And these characteristics are grouped <p 10>in two psychical and fundamental abnormalities, namely, moral insensibility and want of foresight. Moral insensibility, which is decidedly more congenital than contracted, is either total or partial, and is displayed in criminals who inflict personal injuries, as much as in others, with a variety of symptoms which I have recorded elsewhere, and which are eventually reduced to these conditions of the moral sense in a large number of criminals--a lack of repugnance to the idea and execution of the offence, previous to its commission, and the absence of remorse after committing it.