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One genetic hint was obtained from a correlation of delusions with lesions in general paresis, in which disease perhaps the most profound and disastrous of all alterations of personality are found. Amidst the other alterations of personality found in paresis, autopsychic delusions are characteristic: indeed allopsychic delusions are conspicuously few in our series.

Put briefly, the deluded patient is more apt to divine correctly the diseases of his body than his devilments by society. Our statistical analysis, therefore, set us drifting toward disorder of personality as the source of many delusions apparently derived ab extra and tended to swell the group of autopsychic cases at the expense of the allopsychic group,

The group of 22 cases thus sifted out can be studied from many points of view. We may recall that our former study of allopsychic delusions proved that a large proportion of delusions concerning the environment were in all probability not essentially derived from the environment.

In fact we really found only 6 out of 58 cases of pure allopsychic delusions, which could be safely taken as showing so much coincidence between anamnesis and delusions that a correlation could be risked. Following the method of our former work on somatic and on environmental delusions, we sought in the first instance PURE cases of autopsychic delusion-information.

Suggestion that allopsychic delusions are as a rule in some sense autopsychic. Work on fifth-decade psychoses. Statistical summary. Three cases of senile dementia, delusions of grandeur, and frontal lobe changes. Three cases with religious delusions. Remainder of pleasant-delusion group. Group with unpleasant delusions. Nephrogenic group.

In a few cases it seemed that something like a close correlation did exist between such allopsychic delusions and the conditions which had surrounded the patient the delusory fears of insane merchants ran on commercial ruin, and certain women dealt in their delusions largely with domestic debacles.