[44] Early in 1919 the eighteenth amendment to the federal constitution was adopted, prohibiting the liquor traffic after one year.
[45] The rate for other persons than publishers is four cents a pound.
[46] Already in 1906 a system of postal savings banks had been established in the Philippine Islands, where it was giving entire satisfaction.
[47] The United States has long had "parcels post" treaties with a number of foreign countries, however, by which parcels weighing as much as eleven pounds may be sent through the mails to those countries at the rate of twelve cents per pound.
[48] The receipts of the New York post office are about $45,000,000 a year.
[49] Notwithstanding the large number of employees in the patent office, the office is self-supporting by reason of the fees charged and the large number of applications, the annual receipts amounting to more than $2,000,000.
[50] An inventor who needs more time in which to perfect his invention and to forestall the action of some one else may secure a caveat which gives him a year in which to complete his invention.
Trade-marks are also registered by the patent office provided they are to be used in interstate commerce. Trade-marks in other cases are usually protected by state registration.
[51] In 1918 when the World War closed some 2,000,000 Americans were under arms in France and about 2,000,000 were in the training camps and schools in the United States.
[52] The actual strength of the national guard in 1921 was about 113,600 men. But the plans for its development contemplate an ultimate strength of 425,000 men.