found to arise from particles moving in an orbit similar Coming in

That which comes, as revenue or to that of a faint comet which appeared in 1866, just before the remarkable meteoric showers of that and the following years. The comet may be expected in 1898 and the showers in the following two years. Another curious fact lately discovered is that several comets, which cannot po ibly be identical, sometimes income. "What are thy rents? what are thy comings-in?"-Shaks. Commen's al, a. [Lat. com (cum), together, mensa , table.] Eating at the same table with another or others. -In the biological sense, a ociated with another, as described under COMMENSALISM. move in nearly the same orbits. This was the case of -n. A table companion; one who eats at the same board. the comets of 1843, 1880 and 1882, all so bright as to be -In biology, a commensal organism. visible to the naked eye. The latter is, in fact, the last brilliant comet which has appeared up to the date of the present article. These comets were all remarkable for their very close approach to the sun. On this account it is impo ible to predict their return, but all calculations show that each of them must have a period of at least several centuries. - Periodic Comets . The following table includes all those comets which, by a return to perihelion, have demonstrated their periodicity: IMG:content-0492.png:[blocks in formation] De Vico's comet, discovered fifty years ago, had a computed period of 5% years, but was not again seen until 1895. The elements of this comet are so nearly identical with those of the Edward Swift comet as to leave no doubt that they are one and the same. So, also, the Lexell comet, lost for 125 years, though its period is only 5% years, is thought to be identical with that of Swift III, discovered in 1895, the elements being very similar. It will be noticed that all of the comets of established periodicity, except the three last named, have short periods. Barnard's second comet was undoubtedly seen once in 1895.-References: Guillemin's World of Comets.