The point may be illustrated as follows: Let it be supposed that a firm or company has decided to invest $100,000 in the 5-per-cent equipment bonds of a good railroad maturing in three years, which can be obtained at par, merchant's paper then commanding about 5-1/2 per cent. After two years it becomes necessary for the firm to realize on its investment at a time when commercial paper is floated with difficulty on a 6-1/2-per-cent or 7-per-cent basis. Under such money conditions the equipment bonds could be sold on about a 6-per-cent basis, which would mean a price of 99 for a 5-per-cent bond with one year to run. The firm, in liquidating its investment, would therefore lose 1 per cent in principal, but would have received 5 per cent interest for two years, making the net return 4-1/2 per cent. Compare this showing with the result if the bonds when originally bought had had ten years to run instead of three. After two years, when the firm wished to dispose of its bonds it might experience some difficulty in doing so in the stringent money market which has been supposed, but even if it succeeded in selling them upon a 6-per-cent basis, that would mean a price of only 93-3/4 and would represent 6-1/4-per-cent loss in principal. If it were necessary to sell the bonds upon a higher basis or if the firm had purchased a bond with more than ten years to run, the relative disadvantage of the longer bond would be still more apparent. These points sufficiently demonstrate the importance of buying only short-term securities for the investment of a business surplus. Of course, if money conditions improve instead of becoming worse between the dates of purchase and sale, then a greater profit would be made with the longer-term bond. This, however, should not be allowed to influence the choice, first because it is not the object of a reserve fund to make a speculative profit, and secondly because a firm or corporation is only likely to want to realize upon its reserve fund when money is hard to obtain otherwise, and that is precisely the time when any long-term bond would be apt to show considerable depreciation. The foregoing considerations indicate a special adaptability on the part of equipment bonds to the usual requirements of a business surplus. The points have been brought out at some length because of the importance of the subject to the average business man. The purpose in concentrating attention upon a single instance has been to illustrate more clearly the principles involved and at the same time to acquaint the business man with details of a highly desirable and somewhat unfamiliar form of security. IV REAL-ESTATE MORTGAGES