Tanzi's classification is rather more simple than Kraepelin's. He separates melancholia from mania and circular psychoses, however. He places idiocy among the cerebropathies, thus separating it from imbecility, which he puts among the degenerative mental anomalies. The book includes chapters on the seat of the psychic processes, the causes of mental diseases, anatomic substratum of mental diseases, sensibility, ideation, memory, the sentiments, movements and other external reaction, classification of mental diseases, pellagra, alcoholism, amentia, the thyroid psychoses, progressive paralysis, infantile cerebropathies, adult cerebropathies, the affective psychoses, neurasthenia, hysteria, epilepsy, dementia præcox, sexual perversions, constitutional immoralities, paranoia, imbecility and asylums. The translation is remarkably good.