In an action for commissions for the sale of a lease, where the petition alleged that plaintiff negotiated the sale of a lease, and after reaching an agreement whereby the purchaser, agreeing to pay a certain price for the lease, the purchaser paid that amount to the defendant, an instruction based on the theory that plaintiff had found a purchaser ready, willing and able to buy the lease and brought him into communication with defendant, is erroneous because outside the scope of the petition. Northup v. Diggs, 128 Mo. App. 217, 106 S. W. 1123.