The law will not permit a man to act in the double capacity of principal and agent. Dwight v. Blackmar, 2 Mich. 330. Where the owner of land agreed to sell it to real estate brokers, who at first stated that they were acting for themselves, but afterwards, before the contract was made, stated that they were acting as brokers, and the contract was made to a third person, proof of their employment before the making of the contract was not essential to their right to commissions. Shapiro v. Shapiro, 103 N. Y. S. 305, 117 App. Div. 817.

That a broker contracted to secure a loan and perform other services for an agreed commission, advances money on the loan secured by a mortgage taken in the name of another as mortgagee, intending to sell the mortgage, did not constitute him a dual agent so as to forfeit his commission. In re Williams, 252 F. 924.