CHARLES H. HIGGINS, ASSOC. M. AM. SOC. C. E.—Mr. Riggs' able and timely paper is of great interest and worth to all concerned with the matter of values, whether of public service corporation property, or other property; and what engineer is not concerned with values? One cannot but wish that an index accompanied the paper, as its usefulness would be thereby greatly increased, particularly as, by its arrangement, such subjects as depreciation, non-physical values, etc., are treated of in many different portions of the paper. _The Wisdom of Having a Physical Valuation._—It is hard to understand how any thoughtful person can now doubt this, for we are in a period of regulation and taxation of public service corporations, and the only question is whether they shall be regulated and taxed with a full understanding of the investment involved, or by arbitrary methods, such as the 2 cents per mile passenger rate, which has been so popular in many States, under widely different conditions and irrespective of the cost of the service. The time would seem to have arrived when the thoughtful public service corporation manager would welcome a fair valuation of the company's property, as protection against legislation conceived in ignorance of the capital invested. _Relation Between Railroads and Other Properties._—The relation between appraisals of railroad and of water, gas, and traction companies is very close, and the same general principles apply. In the former, however, it is complicated more often by the fact that the lines of a railroad extend through many States, with terminals in one or two, and, further, that the railroads have many subsidiary, controlled, or dependent companies, such as coal, lighterage, terminal, car, warehouse, contracting, elevator, stock yard, and supply companies, often owned, wholly or in part, by men in the railroad management. Agreements with these companies may greatly affect the non-physical values, as determined by the methods advocated in this paper, which may otherwise be sound. _Valuation of All Properties._—The author says that the valuation of all railroad properties in the country "would be of interest." It would be more; it would be of value infinitely greater than the cost. The mere presence of light prevents many vices, and this is as true in corporation practices as in the streets. It is in accord with Dr. Woodrow Wilson's "pitiless publicity"; and, which is, perhaps, more important, it is the basis, or should be, of all legislation concerning the regulation of these great highways.