What are specific goods? which section?

Goods identified and agreed upon at the time a contract of sale is made SOGA s 61 > Howell v Coupland 1876 - the defendant agreed to sell 200 tons of potatoes to the claimant on this specific plot of land. on this specific farm. Due to disease, they could only give 80 tons of potatoes. Claimant brought action. They won due to the claimant wanting those specific potatoes, and not just any the defendant could get their hands on