The influence of heredity, even in the strict sense of the word, in the production of criminals, does not always lie in the passing on of developed proclivities. Sometimes a generation of criminals is merely one stage in the progressive degeneration of a family. Sometimes crime seems to be the method by which the degenerating organism seeks to escape from an insane taint in the parents. Of the inmates of the Elmira Reformatory, 499, or 13.7 per cent., have been of insane or epileptic heredity. Of 233 prisoners at Auburn, New York, 23.03 per cent. were clearly of neurotic (insane, epileptic, etc.) origin; in reality many more. Virgilio found that 195 out of 266 criminals were affected by diseases that are usually hereditary. Rossi found 5 insane parents to 71 criminals, 6 insane brothers and sisters, and 14 cases of insanity among more distant relatives. Kock found morbid inheritance in 46 per cent. of criminals. Marro, who has examined the matter very carefully, found the proportion 77 per cent., and by taking into consideration a large range of abnormal characters in the parents, the proportion of criminals with bad heredity rose to 90 per cent. He found that an unusually large proportion of the parents had died from cerebro-spinal diseases, and from phthisis. Sichard, examining nearly 4000 German criminals in the prison of which he is Director, found an insane, epileptic, suicidal, and alcoholic heredity in 36.8 per cent. incendiaries, 32.2 per cent. thieves, 28.7 per cent. sexual offenders, 23.6 per cent. sharpers. Penta found among the parents of 184 criminals only 4 to 5 per cent. who were quite healthy.