time with another conveyance, containing conditions upon the performance of which the estate created may be "defeated" or totally undone.1 A bond for a reconveyance upon the payment of a specific sum, at a specified time, made at the same time and of the same date as a deed of conveyance.2 Formerly, every mortgagor enfeoffed the mortgagee who simultaneously executed a deed of defeasance, considered a part of the mortgage, whereby the feoffment was rendered void on repayment of the money at a certain day. But things that were merely executory, or to be completed by matters subsequent, could always be recalled by defeasances made subsequent to the time of their creation.1 It is not of the essence of a mortgage that there should be a defeasance; and there may be a defeasance of a deed of conveyance without constituting it a mortgage. The essence of a defeasance is to defeat the principal deed and make it void ab initio, if the condition be performed.3 A defeasance made subsequently to an executed contract must be part of the original transaction. At law, the instrument must be of as high a nature as the principal deed. Defeasances of deeds conveying realty are subject to the same rules as such deeds themselves, as to record and notice to purchasers; but in some States notice of the existence of a defeasance, to be binding, must be derived from the public records. When an absolute deed is shown to have been originally made as security for a loan of money, a court of equity will treat it as a mortgage, and allow the grantor to redeem the estate, on the ground that the defeasance was omitted from the deed by fraud or mistake.. But to reduce a conveyance to a mortgage the defeasance may be required by statute to be in writing, duly acknowledged and recorded.. 2. A defeasance to a bond, recognizance, or judgment recovered is a condition which, when performed, defeats or undoes it, in the same manner as a defeasance to an estate. The "condition" of a bond is always inserted in the bond or deed itself; a "defeasance" is made by a separate, and frequently by a subsequent, deed. This, like the condition of a bond, when performed, disincumbers the obligor's estate. See CONDITION. See DEFEASANCE; CONDITION. 1 [2 Bl. Com. 327. 2 [Butman v. James, 34 Minn. 550 (1885), Berry, J.; 4 Pick. 352. 3 Flagg v. Mann, 2 Sumn. 540 (1837), Story, J. See 21 Ala. 9; 3 Mich. 482; 7 Watts, 261, 401; 13 Mass. 443; 40 Me. 381; 43 id. 206; 14 Wend. 63; 17 S. & R. 70; 2 Washb. R. P. 489. $2 Kent, 142; Butman v. James, 34 Minn. 550 (1886). See Penn. Act 8 June, 1881; Mich. R. S. 261; Minn. St. L., 1873, 34, § 23. 12 Bl. Com. 342; 43 Me. 371; 14 N. J. L. 364.