What one does deplore is memory for the mere words with no understanding of the meaning. In geometry, for example, a student sometimes commits to memory the words of a demonstration, with no understanding of the meaning. Of course, that is worse than useless. One should remember the meaning of the demonstration. If one has memorized the words only, he cannot solve an original problem in geometry. But if he has understood the meaning of the demonstration, then he recalls it, and is enabled to solve the problem. If one does not remember the various facts about the relationships in a triangle, he cannot solve a problem of the triangle until he has worked out and discovered the necessary facts. Then memory would make them available for the solution of the problem. =Memory and School Standing.= That memory plays a large part in our life is evident; and, of course, it is an important factor in all school work. It matters not what we learn, if we do not remember it. The author has made extensive experiments to determine the relation that memory has to a child's progress in school. The method used was to give logical memory tests to all the children in a school and then rank the children in accordance with their abilities to reproduce the story used in the test. Then they were ranked according to their standing in their studies. A very high correlation was found. On the whole, the pupils standing highest in the memory tests were found to stand highest in their studies. It is true, of course, that they did not stand highest merely because they had good memories, but because they were not only better in memory, but were better in most other respects too. Pupils that are good in logical memory are usually good in other mental functions. A test of logical memory is one of the best to give us an idea of the school standing of pupils. Not only is the retention of ideas of very great importance itself, but the acquiring of ideas, and the organizing of them in such a way as to remember them involves nearly all the mental functions. The one who remembers well ideas logically related, is the one who pays the closest attention, the one who sees the significance, the one who organizes, the one who repeats, the one who turns things over in his mind. A logical memory test is therefore, to some extent, a test of attention, association, power of organization as well as of memory; in a word, it is a test of mental power.