Another striking illustration of the tendency of alcohol to impair the higher mental processes was given by some experiments instituted by Kraepelin to test the association of ideas, In these experiments, a word is pronounced, and the subject is required to pronounce the first word that suggests itself in response. Some very interesting secrets of the subconscious personality are revealed thereby, as was shown, for example, in a series of experiments conducted last year at Zürich by Dr. Frederick Peterson of New York. But I cannot dwell on these here. Suffice it for our purpose that the possible responses are of two general types. The suggested word being, let us say, "book," the subject may (1) think of some word associated logically with the idea of a book, such as "read" or "leaves"; or he may (2) think of some word associated merely through similarity of sound, such as "cook" or "shook." In a large series of tests, any given individual tends to show a tolerably uniform proportion between the two types of association; and this ratio is in a sense explicative of his type of mind. Generally speaking, the higher the intelligence, the higher will be the ratio of logical to merely rhymed associations. Moreover, the same individual will exhibit more associations of the logical type when his mind is fresh than when it is exhausted, as after a hard day's work. In Kraepelin's experiments it appeared that even the smallest quantity of alcohol had virtually the effect of fatiguing the mind of the subject, so that the number of his rhymed responses rose far above the normal. That is to say, the lower form of association of ideas was accentuated, at the expense of the higher. In effect, the particular mind experimented upon was always brought for the time being to a lower level by the alcohol. _The Effect of a Bottle of Wine a Day_ When a single dose of alcohol is administered, its effects gradually disappear, as a matter of course. But they are far more persistent than might be supposed. Some experiments conducted by Fürer are illuminative as to this. He tested a person for several days, at a given hour, as to reaction-time, the association of ideas, the capacity to memorize, and facility in adding. The subject was then allowed to drink two litres of beer in the course of a day. No intoxicating effects whatever were to be discovered by ordinary methods. The psychological tests, however, showed marked disturbance of all the reactions, a diminished capacity to memorize, decreased facility in adding, etc., not merely on the day when the alcohol was taken, but on succeeding days as well. Not until the third day was there a gradual restoration to complete normality; although the subject himself--and this should be particularly noted--felt absolutely fresh and free from after-effects of alcohol on the day following that on which the beer was taken.