The question is--What is the nature of the rights of a real property mortgagee in those jurisdictions which adopt the lien or equitable theory3 of the mortgage? In one sense this question calls for a full statement of the law of mortgages but that, of course, is not the sense in which the writer puts it. He means by it to put a broader and more scientific question--a question, be it at once confessed, of jurisprudence--yet a question which has an important bearing on, if it is not in fact conclusive of, several specific problems in the law, which will be examined in a subsequent paper.
Durfee, Edgar N. "The Lien or Equitable Theory of the Mortgage--Some Generalizations." Mich. L. Rev. 10 (1912): 587-607.