[82] A recent example is found in the regulations issued by President Taft for putting into effect the new law levying a tax on corporations. The meaning of the law in various particulars had to be interpreted, and the method and means of assessing and collecting the tax had to be prescribed. Another example was the regulations issued by President Wilson in 1913 for the collection of the income tax. =The Veto Power.=--Finally, the President is given an important share in legislation through the constitutional requirement which requires that all bills and resolutions passed by Congress shall be submitted for his approval.[83] The power to withhold his approval of the acts passed by Congress is popularly known as the veto power. It was called by the framers of the Constitution the President's "qualified negative." This prerogative constitutes an exception to the principle of the separation of governmental powers, and was conferred upon the executive as a means of enabling him to defend his constitutional powers and privileges against the encroachments of the legislative department, as well as to provide a check upon hasty and careless legislation by Congress. The conditions under which the right of veto may be exercised, the forms which it may take, and the procedure by which it may be overridden by Congress are discussed in chapter xi. The President may veto a bill because he believes it to be unconstitutional, or because he believes it is unwise or inexpedient, though in both cases a wise executive will be slow to set his judgment against the combined judgment of the members of Congress. [83] Ex-President Benjamin Harrison, in his book "This Country of Ours," p. 138, thus describes the course which a bill takes after it has passed both houses: "When a bill has passed both houses of Congress and has been signed by the president of the senate and the speaker of the house, it is taken, by the clerk of the committee on enrolled bills, to the Executive Mansion, where the date of its delivery is stamped upon it. The practice is then to send the bill to the head of the department to which its subject matter belongs--to the war department, if to army matters; to the interior, if to pensions, or public lands, or Indian affairs, etc.--for the examination of the secretary, and for a report from him as to any objections that may occur to him. As to the frame of the bill, and as to any constitutional questions involved, the attorney-general is often consulted, though the bill does not relate to his department. The President then takes up the bill, with the report from the department, and examines it, and if he approves writes thereon "Approved," giving the date, and signs his name. The bill, now become a law, is then sent to the state department to be filed and published in the statutes at large."