The clinical pictures produced by drugs and other exogenous poisons are principally deliria or states of confusion; although sometimes hallucinatory and paranoid reactions are met with. Certain poisons and gases apparently produce special symptoms, e.g., cocaine, lead, illuminating gas, etc. Grouped according to the toxic etiological factors the following are to be differentiated:

(a) Opium (and derivatives), cocaine, bromides, chloral, etc., alone or combined (to be specified).

(b) Metals, as arsenic, lead, etc. (to be specified).

(c) Gases (to be specified).

(d) Other exogenous toxins (to be specified).