The jurisdiction of courts of equity by the writ of injune tion, though of English origin, is largely the result of Amer ican growth and development. Perhaps no branch of equity jurisprudence owes more to the decisions of American courts, and the growing frequency of the use of this writ, of late years, has invested the subject with a new importance. Of the more recent text-books upon the Law of Injunctions, that of Mr. Hilliard, professing to be purely American, contains, of course, but few citations of English cases, while the English treatises of Mr. Kerr and Mr. Joyce, though complete and exhaustive so far as regards the English authorities, contain but few references to the opinions of our courts, and leave the rich field of American decisions almost untouched. And the fact that very many of the English authorities, noticeably those of recent date, are modified by statutes which are inap plicable here, has seemed to the author to create an additional necessity for a work which should be based upon the decis ions of both countries, and which should present the general principles governing courts of equity, both in England and America, in the administration of preventive relief.