universe were still to be maintained. Still even with this correction the belief remained down to the Stoic School that being is essentially self-ordering: that Nature is immanent proportion. The Measure thus emerging as the Mean, which stands out as the permanent background or recurrent same amidst varying extremes, is set against these divergencies and used to measure them. It has to serve as a denominator for all of these: or each of these differences has a definite ratio to it. For that purpose it must be so graded or present such a scale that the smallest difference from it that exists may be measured, estimated and defined in terms of it. It is here out of place to consider how this can be accomplished,--how mensuration in any case is solved as a problem of scientific determination. What is more important is to note the fact that appearances everywhere start up to testify to the incompatibility of the two elements in measure,--to their tendency to fly away from each other. It is only within certain ranges that quantity and quality change proportionately to each other. The colour spectrum, the scale of musical notes, the series of chemical combination, the order of the planets, all are found in experience up to some point to follow a symmetrical order, and exhibit a measure. But after that point is reached, a sudden change or transition occurs. There is a break in the continuity of being: without warning, a new series of physical manifestation, having a new rule or measure, emerges by a sort of catastrophe. So also, it is only to a certain portion of the process of physical order in the human body that psychical changes are found to correspond. Everywhere the correspondence or harmony or proportion of immediate fact has its breaks,--its sudden emergencies into a new range of being.