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 COUES, ELLIOTT (1842–1899), American naturalist, was born at Portsmouth, New Hampshire, on the 9th of September 1842. He graduated at Columbian (now George Washington) University, Washington, D.C., in 1861, and at the Medical school of that institution in 1863. He served as a medical cadet at Washington in 1862–1863, and in 1864 was appointed assistant-surgeon in the regular army. In 1872 he published his Key to North American Birds, which, revised and rewritten in 1884 and 1901, has done much to promote the systematic study of ornithology in America. In 1873–1876 Coues was attached as surgeon and naturalist to the United States Northern Boundary Commission, and in 1876–1880 was secretary and naturalist to the United States Geological and Geographical Survey of the Territories, the publications of which he edited. He was lecturer on anatomy in the medical school of the Columbian University in 1877–1882, and professor of anatomy there in 1882–1887. He resigned from the army in 1881 to devote himself entirely to scientific research. He was a founder of the American Ornithologists’ Union, and edited its organ, The Auk, and several other ornithological periodicals. He died at Baltimore, Maryland, on the 25th of December 1899. In addition to ornithology he did valuable work in mammalogy; his book Fur-Bearing Animals (1877) being distinguished by the accuracy and completeness of its description of species, several of which are already becoming rare. In 1887 he became president of the Esoteric Theosophical Society of America. Among the most important of his publications, in several of which he had collaboration, are A Field Ornithology (1874); Birds of the North-west (1874); Monographs on North American Rodentia, with J. A. Allen (1877); Birds of the Colorado Valley (1878); A Bibliography of Ornithology (1878–1880, incomplete); New England Bird Life (1881); A Dictionary and Check List of North American Birds (1882); Biogen, A Speculation on the Origin and Motive of Life (1884); The Daemon of Darwin (1884); Can Matter Think? (1886); and Neuro-Myology (1887). He also contributed numerous articles to the Century Dictionary, wrote for various encyclopaedias, and edited the Journals of Lewis and Clark (1893), and The Travels of Zebulon M. Pike (1895).

 COULISSE (French for “groove,” from couler, to slide), a term for a groove in which a gate of a sluice, or the side-scenes in a theatre, slide up and down, hence applied to the space on the stage between the wings, and generally to that part of the theatre “behind the scenes” and out of view of the public. It is also a term of the Paris Bourse, derived from a coulisse, or passage in which transactions were carried on without the authorized agents de change. The name coulissier was thus given to unauthorized agents de change, or “outside brokers” who, after many attempts at suppression, were finally given a recognized status in 1901. They bring business to the agents de change, and act as intermediaries between them and other parties. (See : Paris.)

 COULOMB, CHARLES AUGUSTIN (1736–1806), French natural philosopher, was born at Angoulême on the 14th of June 1736. He chose the profession of military engineer, spent three years, to the decided injury of his health, at Fort Bourbon, Martinique, and was employed on his return at Rochelle, the Isle of Aix and Cherbourg. In 1781 he was stationed permanently at Paris, but on the outbreak of the Revolution in 1789 he resigned his appointment as intendant des eaux et fontaines, and retired to a small estate which he possessed at Blois. He was recalled to Paris for a time in order to take part in the new determination of weights and measures, which had been decreed by the Revolutionary government. Of the National Institute he was one of the first members; and he was appointed inspector of public instruction in 1802. But his health was already very feeble, and four years later he died at Paris on the 23rd of August 1806. Coulomb is distinguished in the history alike of mechanics and of electricity and magnetism. In 1779 he published an important investigation of the laws of friction (Théorie des machines simples, en ayant regard au frottement de leurs parties et à la roideur des cordages), which was followed twenty years later by a memoir on fluid resistance. In 1785 appeared his Recherches théoriques et expérimentales sur la force de torsion et sur l’élasticité des fils de métal, &c. This memoir contained a description of different forms of his torsion balance, an instrument used by him with great success for the experimental investigation of the distribution of electricity on surfaces and of the laws of electrical and magnetic action, of the mathematical theory of which he may also be regarded as the founder. The practical unit of quantity of electricity, the coulomb, is named after him.

 COULOMMIERS, a town of northern France, capital of an arrondissement in the department of Seine-et-Marne, 45 m. E. of Paris by rail. Pop. (1906) 5217. It is situated in the fertile district of Brie, in a valley watered by the Grand-Morin. The church of St Denis (13th and 16th centuries), and the ruins of a castle built by Catherine of Gonzaga, duchess of Longueville, in the early 17th century, are of little importance. There is a statue to Commandant Beaurepaire, who, in 1792, killed himself rather than surrender Verdun to the Prussians. Coulommiers is the seat of a subprefect, and has a tribunal of first instance and a communal college. Printing is the chief industry, tanning, flour-milling and sugar-making being also carried on. Trade is in agricultural products, and especially in cheeses named after the town.

 COUMARIN, C$9$H$6$O$2$, a substance which occurs naturally in sweet woodruff (Asperula odorata), in the tonka bean and in yellow melilot (Melilotus officinalis). It can be obtained from the tonka bean by extraction with alcohol. It is prepared artificially by heating aceto-ortho-coumaric acid (which is formed from sodium salicyl aldehyde) or from the action of acetic anhydride and sodium acetate on salicyl aldehyde (Sir W. H. Perkin, Berichte, 1875, 8, p. 1599). It can also be prepared by heating a mixture of phenol and malic acid with sulphuric acid, or by passing bromine vapour at 107° C. over the anhydride of melilotic acid. It forms rhombic crystals (from ether) melting at 67° C. and boiling at 290° C., which are readily soluble in alcohol, and moderately soluble in hot water. It is applied in perfumery for the preparation of the Asperula essence. On boiling with concentrated caustic potash it yields the potassium salt of coumaric acid, whilst when fused with potash it is completely decomposed into salicylic and acetic acids. Sodium amalgam reduces it, in aqueous solution, to melilotic acid. It forms addition products with bromine and hydrobromic acid. By the action of phosphorus pentasulphide it is converted into thiocoumarin, which melts at 101° C.; and in alcoholic solution, on the addition of hydroxylamine hydrochloride and soda, it yields coumarin oxime.

Ortho-coumaric acid (o-oxycinnamic acid) is obtained from coumarin as shown above, or by boiling coumarin for some time with sodium ethylate. It melts at 208° C. and is easily soluble in hot water and in alcohol. It cannot be converted into coumarin by heating alone, but it is readily transformed on heating with acetic anhydride or acetyl chloride. By the action of sodium amalgam it is readily converted into melilotic acid, which melts at 81° C., and on distillation furnishes its lactone, hydrocoumarin, melting at 25° C. For the relations of coumaric and coumarinic acid see Annalen, 254, p. 181. The homologues of coumarin may be obtained by the action of sulphuric acid on phenol and the higher fatty acids (propionic, butyric and isovaleric anhydrides), substitution taking place at the carbon atom in the position to the –CO– group, whilst by the condensation of acetoacetic ester and phenols with sulphuric acid the  substituted coumarins are obtained.

Umbelliferone or 4-oxycoumarin, occurs in the bark of Daphne mezereum and may be obtained by distilling such resins as galbanum or asafoetida. It may be synthesized from resorcin and malic anhydride or from resorcyl aldehyde, acetic anhydride and sodium acetate. Daphnetin and Aesculetin are dioxycoumarins.

The structural formulae of coumarin and the related substances are:

