Working Capital.—Working capital is another item claimed and conceded in some valuations. It is not a part of the "cost of construction." The money provided for working capital at the outset is not a permanent investment, but is rather a temporary loan paid back out of earnings. The writer fails to perceive any possible argument in favor of adding such an item to the permanent value of the property. In making an appraisal, after the physical value is determined, it is usual to set up a statement of stores, supplies, fuel, and cash on hand, and working capital is certainly shown by the current balance sheet, in the form of cash or accounts receivable. It would appear to have no place in a physical appraisal. Although the items of cash, stores, and supplies were shown in the Michigan appraisal, they did not appear as part of the physical value, nor were they taken into account in computing intangible value, but, being taxable property, they were reported separately. (_f_) _Contingencies._—The use of a percentage for contingencies in the appraisal in Michigan was bitterly contested by the railroads as improper and excessive. In Michigan 10% was used, in Wisconsin 5½%, and in Minnesota 5 per cent. Subsequent work in Michigan has demonstrated that the use of as high a figure as 10% was fully justified; and the probability is that the latest Michigan appraisal did not eliminate omissions, inaccuracies of description, and excess cost of construction due to difficulties, to such an extent as to justify much reduction in the percentage. In making an appraisal, the percentage to be applied to cover contingencies is a proper matter for consideration, and in some cases conditions might well be such that even a smaller allowance than that fixed in Minnesota would be proper, but such cases would doubtless be the exception. The writer believes it to be proper practice to add liberally for the contingency item. The strongest argument against it is that it is incapable of being described and located definitely, and is difficult of exact proof. Therefore it has been claimed that it partakes of the nature of a non-physical element, and that if there be any value over and above the physical property value, it will appear with other non-physical elements reflected in the earnings, and may be properly included in the intangible value if such exists. This argument does not appeal to the writer as being final, and he would advocate the use of such a percentage of physical values as appears proper in each appraisal to cover the error due to the extreme difficulty of securing an exact inventory and construction history of the properties.