_Formamide_, HCONH2, is obtained by heating ethyl formate with ammonia; by heating ammonium formate with urea to 140 deg. C., 2HCO.ONH4 + CO(NH2)2 = 2HCONH2 + (NH4)2CO3; by heating ammonium formate in a sealed tube for some hours at 230 deg. C., or by the action of sodium amalgam on a solution of potassium cyanate (H. Basarow, _Ber._, 1871, 4, p. 409). It is a liquid which boils _in vacuo_ at 150 deg., but at 192-195 deg. C. under ordinary atmospheric pressure, with partial decomposition into carbon monoxide and ammonia. It dissolves mercuric oxide, with the formation of mercuric formamide, (HCONH)2Hg. FORMOSA, a northern territory of the Argentine republic, bounded N. by Bolivia, N.E. and E. by Paraguay, S. by the Chaco Territory, and W. by Salta, with the Pilcomayo and Bermejo forming its northern and southern boundaries. Estimated area, 41,402 sq. m. It is a vast plain, sloping gently to the S.E., covered with marshes and tropical forests. Very little is known of it except small areas along the Bermejo and Paraguay rivers, where attempts have been made to form settlements. The unexplored interior is still occupied by tribes of wild Indians. The climate is hot, the summer temperature rising to a maximum of 104 deg. F. Timber-cutting is the principal occupation of the settlers, though stock-raising and agriculture engage some attention in the settlements on the Paraguay. The capital, Formosa (founded 1879), is a small settlement on the Paraguay with a population of about 1000 in 1900. The settled population of the territory was 4829 in 1895, which it was estimated had increased to 13,431 in 1905. The nomadic Indians are estimated at 8000.