Reciprocal 3941 Reconstruction to the interior, began an irregular war upon the Dutch settlers, and after twelve years ex- pelled them; p. 472,000. Reciprocal, in mathematics, is the quoti ient obtained by dividing unity by a numbc . The product of a quantity and its recipro- cal is thus unity; and the reciprocal of a fraction is obtained by interchanging numera- tor and denominator. Reciprocating Motion, motion to and fro in a straight line, like that of the piston of a steam-engine, Reciprocity, in economic history, mutual concessions between nations by which tar- iff rates or commercial discriminations are lowered, abolished, or abandoned. Recitative, a species of music—frequently written without key signature—much used in the declamatory passages which constitute an important feature in oratorios and op- eras. Reclamation, U. S. Bureau of, a bureau of the Department of the Interior at Wash- ington, organized in July, 1902, under the Reclamation Act of June 17, 1902. It is en- gaged in the investigation, construction, and operation of irrigation projects in arid and semi-arid States of the far West, and in the establishment of settlers thereon, Among its projects is Boulder Dam on the Colorado, Under pi esent laws, soldiers and sailors of all wars hat e a preference right of 90 days to enter the public land farm unit. The Bureau's library contains descriptions of all projects* Reclamation of Land, the process of making land suitable for agriculture by irri- gation or drainage. Among the most notable achievements in reclamation are the great works constructed by the United States gov- ernment to put water upon the arid public lands in the West. Holland, by its extensive system of dykes and sea-walls, furnishes a notable example of land reclamation, In 1918 a bill was passed by the Dutch Parlia- ment for reclaiming a part of the Zuidcr Zee by building a dyke across the northern part. The entire work will cover a period of some 35 years. Sec CONSERVATION MOVEMENT; PUBLIC LANDS. Recluses, the name given to men and women who, in mediaeval times, left the world to live a Hfo of prayer and contem- plation; dwelling in a cell, usually attached to a church, sometimes within the precincts of a monastery. In modern parlance the term is applied to anyone who mingles little in society. Recognizance, a bond or obligation enter- ed into before a court of record and made a part of the record. Recoil, the backward movement of a gun on being discharged. Reconnaissance, a military term to de- note information as to the theater of opera- tions—the strength, position, morale, etc,, of the different divisions of the enemy in the field—obtained by troops or individuals after the outbreak of hostilities. Reconstruction, a term used in United States history to describe the process by which and the period in which the 'states' that seceded in 1860 and 1861 were brought back into the Union. The collapse of the Confederacy found the victorious North without a settled plan for dealing with the seceded 'states.' Since fundamental Consti- tutional laws had not been provided for such a contingency there were numerous con- flicting plans. The legal problems related mainly to the status (i) of the Southern 'state' organizations, (2) of the Southern people, and (3) of the negroes. Were the ne- groes citizens or wards? Should the 'state' or the federal government fix the status of the ex-slave? Was the 'Union as it was' to be restored, or had a new and more perfect one been evolved from the war struggle ? On Dec. 8, 1863, Lincoln by proclamation an- nounced that he would recognize, so far as the executive could do so, any 'state* reor- ganized by as many as ten per cent, of the number of voters in 1860 who should ask for pardon and take the oath of allegiance to the United States. Congress, however, opposed the President's work by refusing in 1864 to receive senators from Arkansas* and by pass- ing in July, 1864, the Wade-Davis bill which contained an assertion of the right of Con- gress to undertake the work of reconstruc- tion. President Johnson began the work of restoring the seceded 'states' to the Union, As directed by the President, after the con- ventions had planned new 'state* govern- ments, elections were held under the new con- stitutions, the legislatures met, and, with the exception of Mississippi, ratified f-"i proposed Thirteenth Amendment abolishing slavery. Senators and representatives were chosen, and then the officials of the provisional gov- ernment gave place to those elected by the people. This was done in all the 'states' ex- cept Texas before the close of 1865; and the 'restoration' was complete if Congress would accept it by admitting the Southern sena-