Where the evidence shows that defendant's contract to pay plaintiff certain commissions for the sale of lands is either a joint contract with that of other owners of the land or his individual contract, the court properly refused to charge that defendant is only liable for his share of the commission to the extent of his individual interest. Their liabilities can not be apportioned. Mousseau v. La Roche, 80 Ga. 568, 5 S. E. 780.