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Rh "catty" of grain or cotton, until one has first informed himself what kind of "catty" they have at that point. The same holds as to the amount of any crop yielded per "acre," statistics of which are not infrequently presented in ignorance of the vital fact that "acre" is not a fixed term. That a like state of things prevails as to the terms employed to measure distance, every traveller in China is ready to testify. It is always necessary in land travel to ascertain, when the distance is given in "miles" (li), whether the "miles" are "large" or not! That there is some basis for estimates of distances we do not deny, but what we do deny is that these estimates or measurements are either accurate or uniform. It is, so far as we know, a universal experience that the moment one leaves a great imperial highway the "miles" become "long." If 120 li constitute a fair day's journey on the main road, then on country roads it will take fully as long to go 100 li, and in the mountains the whole day will be spent in getting over 80 li. Besides this, the method of reckoning is frequently based, not on absolute distance, even in a Chinese sense, but on the relative difficulty of getting over the ground. Thus it will be "ninety li" to the top of a mountain the summit of which would not actually measure half that distance from the base, and this number will be stoutly held to, on the ground that it is as much trouble to go this "ninety li" as it would be to do that distance on level ground. Another somewhat peculiar fact emerges in regard to linear measurements, namely, that the distance from A to B is not necessarily the same as the distance from B to A! It is vain to cite Euclidian postulates that "quantities which are equal to the same quantity are equal to each other." In China this statement requires to be modified by the insertion of a negative. We could name a section of one of the most important highways in China, which from north to south is 183 li in length, while from south to north it is 190 li", and singularly enough, this holds true no