These data furnished a basis for calculating rates of postage, when the limitation of the zones had been determined, a matter of some little difficulty. The first, and most obvious,

suggestion was that the zones should be reckoned as from each post office, but in view of the fact that there were some 60,000 post offices in the United States, grave practical difficulties would arise with a scheme providing for special rates from each post office. It was then thought the State might be adopted as the unit of area, but the States differ so widely in area that such a system would have resulted inequitably, giving equal postage charges for very unequal services. A citizen in Texas or New York State, for example, would be able to send his parcel many times as far as a citizen of Massachusetts or Delaware. The same objection applied, though not in so great degree, to the county as a unit of area. Moreover, these units would be liable to arbitrary change. Failing the discovery of any satisfactory unit based on the political divisions, recourse was had to purely theoretical divisions, based on the imaginary lines of latitude and longitude. The actual degree parallels were rejected as the limits of the units of area because, within the quadrangle formed by them, there would be a maximum zone distance of some 80 miles; while at the same time, for transmission between two places perhaps only two miles apart but lying on different sides of the line, postage would be chargeable as for the second zone. This difficulty was overcome by an ingenious suggestion, which emanated from the department, to divide the degree quadrangles in four, that is, into squares of 30 minutes dimension, and to allow the sending of parcels at the first zone rate from or to places in every contiguous quadrangle.

Under this method, which was adopted, the United States is divided into 3,500 units of area, which are definite, never-changing, and practically uniform in size, the slight difference in area depending on the distance from the Equator being negligible. Each unit is given an index number, and all post offices in the unit have the same index number. Each unit has its own zone limits, which apply equally to every office in the unit. So that in order to discover for what zone postage is to be charged between two places, it is only necessary to ascertain what are the zone limits for the units of area in which the places are respectively situated. A simple reference to a guide showing in what unit of area the post office of

destination falls, and a consultation of the zone map of the office at which the packet is posted, that is, a map showing the boundaries of each zone measured from the unit of area in which the office is situated as centre, gives in a very short space of time the rate applicable to the parcel.

A simplification of rates and regulations is always attended by a diminution of the difficulties of administration, by economy of actual working, and by convenience to the public. In connection with the proposed parcel post the department, with these objects in view, suggested the abolition of the separate class for printed matter, and its amalgamation with the parcel post matter, thus reducing the number of classes of mail matter to three. The Chairman of the Senate Sub-Committee adopted this suggestion, and embodied it in the Bill which he prepared and introduced in the Senate on the 16th May 1912, retaining, however, a rate of 1 cent per ounce up to 4 ounces, in order to provide for circular matter which, under the third-class rate, passed at 1 cent for 2 ounces. This was apparently a doubling of the rate, but as the average weight of circulars is under 1 ounce, in actual practice the great bulk of them would continue to pass at 1 cent. This provision would, however, raise the rate on all catalogues and circulars weighing more than 1 ounce; and although 90 per cent. of the number of pieces of third-class matter actually posted are under 4 ounces in weight and would have fallen under the proposed special rate, and 50 per cent. are under 1 ounce in weight and would have passed for the same amount as under the existing third-class rate, viz. 1 cent, this provision of the Bill was strenuously opposed by printers and catalogue houses. Not regarding the consolidation of the two classes as in any way essential to the establishment of a parcel post system, the Senate Committee on Post Offices and Post Roads, when they came to consider the Bill, decided to eliminate that feature.

In general this Bill represented the conclusions of the Sub-Committee, and, apart from the foregoing change, was substantially accepted by the Senate Committee. The only other amendments made were an increase of the number of zones from six to eight, with the view of "protecting the local merchant in the field of his business," and a slight raising of

the rates for the shorter distances, partly from a fear that the rates proposed in the Bill would not be self-sustaining, and partly from a desire further to protect the local retail merchant against the catalogue houses.

The essential provisions of the Bill, as thus amended, were embodied in the Post Office Appropriation Bill for the fiscal year 1913, were accepted by Congress, and became law on the 24th August 1912. The actual zones and rates fixed were as follows:—

The rates were:—