"Kraepelin found that the simple reaction period, by which is meant the time occupied in making a mere response to a signal, as, for instance, to the sudden appearance of a flag, was, after the ingestion of a small quantity of alcohol (1/4 to 1/2 ounce), slightly accelerated; that there was, in fact, a slight shortening of the time, as though the brain were enabled to operate more quickly than before. But he found that after a few minutes, in most cases, a slowing of mental action began, becoming more and more marked, and enduring as long as the alcohol was in active operation in the body, _i.e._ four to five hours.... Kraepelin found that it was only more or less automatic work, such as reading aloud, which was quickened by alcohol, though even this was rendered less trustworthy and accurate." Again: "Kraepelin had always shared the popular belief that a small quantity of alcohol (one to two teaspoonfuls) had an accelerating effect on the activity of his mind, enabling him to perform test operations, as the adding and subtracting and learning of figures more quickly. But when he came to measure with his instruments the exact period and time occupied, he found, to his astonishment, that he had accomplished these mental operations, not more, but less, quickly than before.... Numerous further experiments were carried out in order to test this matter, and these proved that _alcohol lengthens the time taken to perform complex mental processes_, while by a singular illusion the person experimented upon imagines that his psychical actions are rendered more rapid." [Illustration: The effect of alcohol upon ability to do mental work.] _Attention_--that is, the power of the mind to grasp and consider impressions obtained through the senses--is weakened by drink. The ability of the mind to associate or combine ideas, the faculty involved in sound _judgment_, showed that when the persons had taken the amounts of alcohol mentioned, the combinations of ideas or judgments expressed by them were confused, foggy, sentimental, and general. When the persons had taken no alcohol, their judgments were rational, specific, keen, showing closer observation. "The words of Professor Helmholtz at the celebration of his seventieth birthday are very interesting in this connection. He spoke of the ideas flashing up from the depths of the unknown soul, that lies at the foundation of every truly creative intellectual production, and closed his account of their origin with these words: 'The smallest quantity of an alcoholic beverage seemed to frighten these ideas away.'"--DR. G. SIMS WOODHEAD, Professor of Pathology, Cambridge University, England. Professor Von Bunge (_Textbook of Physiological and Pathological Chemistry_) of Switzerland says that: