Where a sub-agent had reasonable grounds to understand that the price given him by the principal agent was the owner's price, and concealed no material fact within his knowledge from the purchasers, he incurred no liability by reason of his representation that this was the owner's lowest price, as an agent, acting in good faith and with reasonable care, is not liable for a mistake of his principal. Estes v. Crosby, 176 N. W. 933, amend. of man. den., 177 N. W. 512, - Wis. Sup. - .