Affection. The affections should be tested in an indirect way. "Is your father a bad man?" or "Are your neighbours worthless people? Do they treat you with due respect? Has any one a spite against you? Are you fond of your parents? Are you aware that your brother (or mother) is seriously ill?" Questions concerning relatives and friends are of special interest, because they enable the examiner to ascertain whether they cause the patient emotion of any kind, whether he has any real affection for those beings to whom normal persons are attached, but towards whom born criminals and the insane in general do not manifest love. In the absence of instruments, we must judge of the feelings of patients by their answers and the facial changes caused by emotion, but medico-legal experts naturally prefer a scientific test by means of accurate instruments, by which the exact degree of emotion is registered. These instruments are the plethysmograph and the hydrosphygmograph.
Fig. 28
Criminal's Ear
It is well known that any emotion which causes the heart-beats to quicken or become slower makes us blush or turn pale, and these vaso-motor phenomena are entirely beyond our control. If we plunge one of our hands into the volumetric tank invented by Francis Frank, the level of the liquid registered on the tube above will rise and fall at every pulsation, and besides these regular fluctuations, variations may be observed which correspond to every stimulation of the senses, every thought and above all, every emotion. The volumetric glove invented by Patrizi (see [Fig. 25]), an improvement on the above-mentioned instrument, is a still more practical and convenient apparatus. It consists of a large gutta-percha glove, which is put on the hand and hermetically sealed at the wrist by a mixture of mastic and vaseline. The glove is filled with air as the tank was with water. The greater or smaller pressure exercised on the air by the pulsations of blood in the veins of the hands reacts on the aerial column of an india-rubber tube, and this in its turn on Marey's tympanum (a small chamber half metal and half gutta-percha). This chamber supports a lever carrying an indicator, which rises and falls with the greater or slighter flow of blood in the hand. This lever registers the oscillations on a moving cylinder covered with smoked paper. If after talking to the patient on indifferent subjects, the examiner suddenly mentions persons, friends, or relatives, who interest him and cause him a certain amount of emotion, the curve registered on the revolving cylinder suddenly drops and rises rapidly, thus proving that he possesses natural affections. If, on the other hand, when alluding to relatives and their illnesses, or vice-versa, no corresponding movement is registered on the cylinder, it may be assumed that the patient does not possess much affection.
| Fig. 25 | Fig. 26 | |
| A Volumetric Glove (see [page 224]) | Head of a Criminal Epileptic |
Thus when Bianchi and Patrizi spoke to the notorious brigand Musolino about life in his native woods, his mother, and his sweetheart, there was an immediate alteration in the pulse, and the line registered by the plethysmograph suddenly changed, nor did it return to its previous level until some time afterward.
My father sometimes made successful use of the plethysmograph to discover whether an accused person was guilty of the crime imputed to him, by mentioning it suddenly while his hands were in the plethysmograph or placing the photograph of the victim unexpectedly before his eyes.
Morbid Phenomena. When examining a criminal or even a suspected person, who is nearly always more or less abnormal, it is advisable to investigate the more common morbid phenomena he may be subject to, on which he is not likely to give information spontaneously because he is ignorant of their importance. He should be questioned about his sleep, whether he has dreams, etc. Mental sufferers nearly always sleep badly and are frequently tormented by insomnia and hallucinations. The inebriate imagines he is being pursued by disgusting, misshapen creatures, from which he cannot escape. Epileptics, and frequently also hysterical persons have peculiar obsessions. They fancy they cannot perform certain actions unless they are preceded by certain words and gestures.