"Where, after giving plaintiff a power of attorney to act as agent for the sale of defendant's real estate, plaintiff and a prospective buyer had started to meet the defendant at the property in another State, and defendant put an end to the agency and placed it out of his power to carry out the promise of sale by making a sale to a third person, there was no necessity for plaintiff to put defendant in default before suing for his commissions. Luckett Land & Em. Co. v. Brown, 118 La. 943, 43 S. 628.