_One and Only One Fair Value._—Nothing in Mr. Riggs' paper is of more value than his insistence that there is one and only one fair value of the physical property of a railroad, no matter for what purpose it is to be used. How futile are the misdirected efforts of those who would have it otherwise, for, no matter what the purpose of the appraisal may be, who can foresee the use that may be made of it when it becomes public property? _Cost of Reproduction._—Cost of reproduction less depreciation seems to be the established method—that recognized by the Courts—for arriving at the value of the physical property. Cost, as the author contends, can only be an element in determining the present value, for the owner of a stone bridge has as much right to any appreciation in the value of masonry as the owner of land has in the increased value of his property; and, though the cost early in the life of the structure is usually near its value, it may lose that position. What relation exists between the value of the Pyramid of Cheops and its cost? Now, as then, our unit measure of value is changing. Cost is certainly of historic interest, but present value is the subject for present uses. The points in favor of inspection to determine the physical condition of the object to be valued are convincing, where the structure may be readily inspected. Mortality tables mean little without a history of maintenance. With perfect maintenance there would be no physical depreciation. _Maintenance versus Depreciation._—Depreciation and maintenance are interdependent, so much so that some engineers have advocated dropping the term, "depreciation," and substituting "deferred maintenance." A little thought will make this clear. While this term would not apply in the case of a single rail or car, it is not illogical when applied to a system, built and renewed piecemeal and maintained at a certain standard of usefulness, that is, on all well-managed undertakings of magnitude, units are constantly being replaced, thus maintaining a standard of efficiency. This standard, on the entire system, is usually found to be between 70 and 90% of the cost of reproduction. Some items are even improved, and the cost is charged to the maintenance account, such as that referred to in the paper as "consolidation and adaptation" of roadbed; and only a few, such as steel rails, steadily and progressively become less useful, and even these have a bottom value, that of scrap steel. Nor are examples numerous where all the rails are laid at one time, and they are extremely rare where all are replaced at approximately the same time. When the rails on a street or section are renewed, the cost cannot properly be charged to capital account, except in so far as the new rails are of a more valuable type than the old ones; for, if this were done, there would be no limit to the capitalization as time goes on. Furthermore, the moment it is admitted