In assumpsit by a principal against real estate brokers for money had and received, an instruction that if the brokers sold the principal's farm for $11,000, but accounted to him only for $10,000, the principal is entitled to receive $1,000, is erroneous, where there is evidence that the purchaser, with the principal's knowledge, bought from one who had a prior option on the land, and there is no evidence that the defendants ever received the $1,000. Henshaw v. Wilson, 46 I11. App. 364.