Sherwood agreed to purchase a cow, Rose 2d of Aberlone, from Walker at a price of 5 1/2 cents per pound (about $80). The parties believed the cow to be barren. Sherwood came to Walker’s farm to collect the cow, but at that point it was obvious that Rose was pregnant. Walker refused to give over the cow, which was then worth $750 to $1,000. Sherwood sued. Should he get the cow?