added years? Leaving aside inquiries into Time, and Space Sense--(and what enormous faculty our minds must have that can supply these)--let us go on to Mr. J. McKeen Cattell's analysis of memory--which is perhaps the most interesting of all to the student of mind--the analysis of memory, attention and association of ideas. Just as the eye can only see (attend to) a certain number of vibrations, for if the requisite amount is added to, the result is blankness, darkness, so the mind can only attend to a certain amount of complexity--add to the complexity and attention ceases, but, a certain degree of complexity is necessary to produce any conscious attention at all. In experiments with a Metronome and the ticking of a watch, it is found the attention at certain intervals gets weaker--from 2 to 3 seconds. The impression produced by the ticking of the watch is less distinct, it seems to disappear and then is heard again. "This is not from fatigue in the sense organ," but apparently represents "a natural rhythm in consciousness or attention," which interferes with the accuracy of attention. What a suggestive fact this is! Have we not all at times, felt an inexplicable difficulty in listening and attending to certain speakers, which may perhaps be explained by a difference between the rhythm of our own consciousness, and that of the voice of the speaker. In Association of Ideas the time that it takes for one idea to suggest another has been determined, but of course, it must be the average time, for people differ enormously in the speed in which ideas occur to them. It is impossible to allude here to more points, but in the same interesting article Mr. Mck Cattell considers it proved that "experimental methods can be applied to the study of mind, and that the positive results are significant," and he hopes, "one day, we shall have as accurate and complete a knowledge of mind as we have of the physical world." Beyond this knowledge of mind as a machine, the Psychologist goeth not. He ends, and what do we know more as to what mind is? Philosophy properly so-called, begins here or ought to begin. In science we experiment widely and constantly with mind and arrive at some knowledge of its workings and capacities; we learn occupation with the mind itself as a subject for observation, and we practise a self-analysis, which adds to the sum of general knowledge. Through this study we know more about our senses and their faculties, more of our own tendencies and idiosyncrasies, and in what direction they tend. We are on the way to solve some such problems as: "the influences of early impressions, the ingredients of character, the varying susceptibility to mental anguish, the conquest of the will," and many another. These are beginnings--there is much more to attain to, if we would know mind even scientifically, for we have only attacked its breast works, but we are on the right road, as we believe, towards this most interesting of all sciences--Mind Science.