"Where an agent makes a loan on mortgage, with knowledge of the fact that a prior unrecorded mortgage on the same property exists, taken by him as agent for another person, his principal in the second transaction takes charged with the knowledge of the agent, and can not enforce such second mortgage as against the prior unrecorded mortgage. Constant v. Rochester Univ., 17 N. Y. S. 363. (In the States of Arkansas, North Carolina and Ohio mortgages take precedence solely by priority of record, or notice in previous recorded conveyance of an unrecorded trust deed.) Jones on Mortgages Sec. 539.