_Power of Expulsion._--When a member has once been admitted to his seat, he can be deprived of it only by expulsion, and to prevent the employment of this power for party purposes, the Constitution provides that the concurrence of two thirds of the members shall be necessary to expel a member. Several instances of expulsion have occurred in the past. Senator Blount of Tennessee was expelled from the senate in 1797, and a number of other cases occurred in each house during the Civil War. =Compensation of Members of Congress.=--The Constitution declares that senators and representatives shall receive a compensation for their services, the same to be paid out of the treasury of the United States. Under the Articles of Confederation, each state paid its own members of Congress, and there was no uniformity in respect to the scale of compensation. Some states paid much smaller salaries than others and in order to reduce the burden of maintaining their representatives, the states generally sent to Congress the fewest number of representatives required, and as each state had only one vote, nothing was lost by having a minimum number present. One other objection to the method of state payment was that it tended to make the representative dependent upon his state and caused him to feel that he was the representative of a state rather than of the country as a whole. In fixing the amount of the compensation of its members, Congress is subject to no restrictions. It may fix the salary at any amount it pleases, may make it retroactive in effect or may increase the amount at any time during the term for which the members are chosen. The present salary of senators and representatives is $7,500 per year, but the Speaker of the house receives $12,000 per year. In addition, each member receives an allowance for a secretary, a small sum for stationery, and mileage of twenty cents per mile going and coming by the nearest route between his home and the national capital. This mileage is intended to cover the traveling expenses of the member and his family. In some of the countries of Europe until recently members of Parliament did not receive any compensation from the public treasury unless they happened to be members of the cabinet; this was the rule in Great Britain prior to 1911. Sometimes, however, members who represented the socialist or labor party were paid by voluntary contributions by the members of their party. The advantage of paying members of Congress a reasonable compensation is that it enables competent men without private incomes to serve the state equally with the well-to-do, who are not dependent upon their public salaries for a livelihood.