at the late International Health Exhibition. 17 [tabular material] Table I. [end tabular material] [text]The meaning of Table II, and that of the new word "percentile" which is defined in the heading to that Table, will be understood by the help of a single example, for which I will take the line referring to Strength of Squeeze among males. We see that a discussion was made of 519 measurements in that respect, of men whose ages ranged between 23 and 26; that 95 per cent. of them were able to exert a squeeze with their strongest hand (the squeeze was measured by a spring dynamometer) that surpassed 67 lbs. of pressure; that 90 per cent. could exert one that surpassed 71; 80 per cent. one that surpassed 76; and so on. The value which 50 per cent. exceeded, and 50 per cent. fell short of, is the Median Value; its amount is 85 lbs. This line of the Table consequently presents and exact and very complete account of the distribution of strength in one respect among the middle 90 per cent. of any group of males of the tabular ages similar to those who were measure at the laboratory. The 5 per cent. lowest and the 5 per cent. highest cannot be derived directly from it, but their values may be approximately inferred from the run of the tabular-figures, supplemented by such deductions as the Law of Error may encourage us to draw. Those who wish to apply this law will note that the "probably error" is half the difference between the 25th and the 75th per-centile, which can easily be found by interpolation, and they will draw the per-centiles that correspond respectively to the median value [italics]minus[end italics] twice, three times, and three-and-a-half times the probably error, at the graduations 8.7, 2.4, 0.8, and those that correspond to the median value [italics]plus[end italics] those amounts, at the graduations of 91.3, 97.6, and 99.2. The Table is a mere statement of observed fact; there is no theory whatever involved in its construction, beyond simple interpolations between values that differ little from one another and which have been found to run in very regular series. b [end]