This is said to have been based on Jacobi's somato-aetiological theory (1830) that "there is no disease of the mind existing as such, but that insanity exists solely as the consequence of disease, either functional or organic, in some parts of the body system." Heinroth[137] saw in the various mental disorders a disturbance of one or the other of the normal functions of the mind which he divided into three classes. "If the cause of derangement is in relation to one of these manifestations of mental existence—and to one or another it must belong, since the mind is ever occupied with phenomena related to one out of the three classes—we have only to inquire to which modification the disorder actually refers itself, or whether it affects the feelings, the understanding, or the will. Since one of these has possession of our consciousness, or is at least predominant at every point of time, whichever function of the mind happens to be that which is falling into disorder, by it the form of insanity is determined." Griesinger[138] in 1845, on the other hand, was of the opinion that all classifications must in the end return to the principal forms previously described—mania, melancholia and dementia. In 1860 Morel announced his well-known classification: Hereditary Insanity, which included imbecility and idiocy; Toxic Insanity (alcohol, lead, mercury, etc., as well as cretinism); Insanity produced by the transformation of other diseases (hysterical, epileptic, hypochondriacal); Idiopathic Insanity (general paresis, etc.); Sympathetic Insanity, and Dementia, "a terminative state."