It is impossible to adopt any fixed percentage of depreciation on a given class of buildings; for occupancy, construction, and locality play so large a part in determining the amount. For example, a frame building in a dry, northern climate will outlive, several times over, a building similar in all other respects but situated in the warm, damp climate of some of the Gulf States. The difference in the life of materials in different climates is demonstrated still further by comparing yellow pine railway ties when laid in New England and in Florida. Again, two similar and adjacent buildings will depreciate very unequally if one is occupied by a careful owner and the other by a careless tenant.

*R. N. Carter, in The Accountant, March 7, 1908.