(1)  Where under a contract of sale the property in the goods has passed to the buyer and the buyer wrongfully neglects or refuses to pay for the goods according to the terms of the contract, the seller may sue him for the price of the goods.

   (2)  Where under a contract of sale the price is payable on a day certain irrespective of delivery and the buyer wrongfully neglects or refuses to pay such pirce, the seller may sue him for the price although the property in the goods has not passed and the goods have not been appropriated to the contract.