From Latin decenniuma period of ten yearsdecennium
The number of members, originally 196, is subject to change after each decennial census.
From 1850 to 1900 fairly full industrial statistics were gathered as a part of each decennial census.
But according to the eleventh census the decennial rate of growth of population fell suddenly from over 30%, which the figures had shown between 1870 and 1880, and in every preceding decade of the century, except that of the Civil War, to less than 25%, in spite of an immigration nearly double that of any preceding decade'.
The population at the succeeding decennial censuses was as follows: (1900), 45,246; / (1870), 7 1, 44 0; (1880), 11 5,5 8 7; (1890), 20 4,4 68; (1900), 285,315.
From 1792 to 1799 he was occupied with the measurement of the arc of the meridian extending from Dunkirk to Barcelona, and published a detailed account of the operations in Base du systeme metrique (3 vols., 1806, 1807, 1810), for which he was awarded in 181 o the decennial prize of the Institute.