Several forms of Senile Dementia exist, of which the most common is probably the simple or non-delusional type. Other forms are fundamentally the same as the simple, but with certain superimposed symptoms. Fairly early in this type it becomes unsafe for the patient to continue in business. Due to impairment of memory and judgment he is apt to lose his property. Soon his work is poorly done or neglected entirely. He becomes garrulous and annoys his associates with tiresome repetitions of childish reminiscences, continually wandering from one subject to another. His speech becomes incoherent and his sentences fragmentary. He grows untidy and indifferent to the ordinary niceties and conventions of life. His appetite is either poor or voracious; in the latter case the weight may keep up fairly well. He may be either apathetic or turbulent. If the former, he seems stupid, indifferent, and sleepy. He is credulous, docile, and very suggestible. Patients of the turbulent type are restless and always moving about, either depressed or elated, giving unreasonable orders and then contradicting them. Sleeping poorly, they are apt to get up and wander about the house at night. In men, prostatic disease may cause a recrudescence of sexual feeling. Patients of either type eventually become filthy, soiling their clothing, etc. Even in well advanced cases, however, senile dements are often able to perform well certain habitual activities, such as signing their names, or playing certain games, such as checkers or dominoes. =Confusional Type.=—Another form of Senile Dementia, which may in severe cases usher in the attack, but which usually, when present, is sequent to the simple form, of which it is a more severe grade, is the confusional. The additional symptoms of this type are probably due to defective elimination and the consequent toxicity. Usually unsystematized delusions, and sometimes hallucinations are present. Except for a possible occasional period of remission the confusion is continuous. It varies greatly in degree, now being mild and passive and again active, perhaps developing into delirium. Orientation as to both time and place may be lacking. Such patients may ask for dinner a few minutes after a meal, go to bed at noon, be unable to find their own room, or to recognize their own children. They are apt to be obstinate and peevish. Delusions vary in type but both these and the hallucinations are usually painful and, being referred to the patient’s associates, give rise to the thought that they are trying to kill or otherwise harm him.