First

(furst) Before all others; foremost in rank. F. Intention. See Healing . F. Light Oil, the fraction of coal-tar distilling at a temperature up to 1700 C. It includes a small percentage of ammonia-liquor which is mechanically contained in the tar, and is separated from the tar-oils by being allowed to stand and settle out, when it is drawn off. The specific gravity of this fraction is about.975, and it is made up of benzene, toluene, and higher homologues, with phenol, cresol, naphthalene, etc. Fischer's Operation. See Operations, Table of. F.'s Test. See Tests, Table of.