Section 17. (No Property Passes until Goods are Ascertained.) Where there is a contract to sell unascertained goods no property in the goods is transferred to the buyer unless and until the goods are ascertained, but property in an undivided share of ascertained goods may be transferred as provided in section 6.

Section 18. (Property in Specific Goods Passes When Parties So Intend.) (1) Where there is a contract to sell specific or ascertained goods, the property in them is transferred to the buyer at such time as the parties to the contract intend it to be transferred.

(2) For the purpose of ascertaining the intention of the parties regard shall be had to the terms of the contract, the conduct of the parties, usages of trade and the circumstances of the case.

Section 19. (Rules for Ascertaining Intention.) Unless a different intention appears, the following are rules for ascertaining the intention of the parties, as to the time at which the property in the goods is to pass to the buyer.

Rule 1. Where there is an unconditional contract to sell specific goods, in a deliverable state, the property in the goods passes to the buyer when the contract is made, and it is immaterial whether the time of payment, or the time of delivery, or both, be postponed.

Rule 2. Where there is a contract to sell specific goods and the seller is bound to do something to the goods, for the purpose of putting them into a deliverable state, the property does not pass until such thing be done.

Rule 3. (1) When the goods are delivered to the buyer "on sale or return," or on other terms indicating an intention to make a present sale, but to give the buyer an option to return the goods instead of paying the price, the property passes to the buyer on delivery, but he may revest the property in the seller by returning or tendering the goods within the time fixed in the contract, or, if no time has been fixed, within a reasonable time.

(2) When goods are delivered to the buyer on approval or on trial or on satisfaction, or other similar terms, the property therein passes to the buyer (a) When he signifies his approval or acceptance to the seller or does any other act adopting the transaction.

(b) If he does not signify his approval or acceptance to the seller but retains the goods without giving notice of rejection, then if a time has been fixed for the return of the goods, on the expiration of such time, and, if no time has been fixed, on the expiration of a reasonable time. What is a reasonable time is a question of fact

Rule 4. (1) Where there is a contract to sell unascertained or future goods by description, and goods of that description and in a deliverable state are unconditionally appropriated to the contract, either by the seller with the assent of the buyer, or by the buyer with the assent of the seller, the property in the goods thereupon passes to the buyer. Such assent may be expressed or implied, and may be given either before or after the appropriation is made.

(2) Where, in pursuance of a contract to sell, the seller delivers the goods to the buyer, or to a carrier or other bailee (whether named by the buyer or not) for the purpose of transmission to or holding for the buyer, he is presumed to have unconditionally appropriated the goods to the contract, except in cases provided for in the next rule and in section 20. This presumption is applicable, although by the terms of the contract, the buyer is to pay the price before receiving delivery of the goods, and the goods are marked with the words "collect on delivery" or their equivalents.

Rule 5. If the contract to sell requires the seller to deliver the goods to the buyer, or at a particular place, or to pay the freight or cost of transportation to the buyer, or to a particular place, the property does not pass until the goods have been delivered to the buyer or reached the place agreed upon.

Section 20. (Reservation of Right of Possession or Property When Goods Are Shipped.) (1) Where there is a contract to sell specific goods, or where goods are subsequently appropriated to the contract, the seller may, by the terms of the contract or appropriation, reserve the right of possession or property in the goods until certain conditions have been fulfilled. The right of possession or property may be thus reserved notwithstanding the delivery of the goods to the buyer or to a carrier or other bailee for the purpose of transmission to the buyer.

(2) Where goods are shipped, and by the bill of lading the goods are deliverable to the seller or his agent, or to the order of the seller or his agent, the seller thereby reserves the property in the goods. But if, except for the form of the bill of lading, the property would have passed to the buyer on shipment of the goods, the seller's property in the goods shall be deemed to be only for the purpose of securing performance by the buyer of his obligations under the contract

(3) Where goods are shipped, and by the bill of lading the goods are deliverable to the order of the buyer or of his agent, but possession of the bill of lading is retained by the seller or his agent, the seller thereby reserves a right to the possession of the goods as against the buyer.

(4) Where the seller of goods draws on the buyer for the price and transmits the bill of exchange and bill of lading together to the buyer to secure acceptance or payment of the bill of exchange, the buyer is bound to return the bill of lading if he does not honor the bill of exchange, and if he wrongfully retains the bill of lading he acquires no added right thereby. If, however, the bill of lading provides that the goods are deliverable to the buyer or to the order of the buyer, or is indorsed in blank, or to the buyer by the consignees named therein, one who purchases in good faith, for value, the bill of lading, or goods from the buyer will obtain the property in the goods, although the bill of exchange has not been honored, provided that such purchaser has received delivery of the bill of lading indorsed by the consignee named therein, or of the goods, without notice of the facts making the transfer wrongful.

Section 21. (Sale by Auction.) In the case of sale by auction (1) Where goods are put up for sale by auction in lots, each lot is the subject of a separate contract of sale.

(2) A sale by auction is complete when the auctioneer announces its completion by the fall of the hammer, or in other customary manner. Until such announcement is made, any bidder may retract his bid; and the auctioneer may withdraw the goods from sale unless the auction has been announced to be without reserve.

(3) A right to bid may be reserved expressly by or on behalf of the seller.

(4) Where notice has not been given that a sale by auction is subject to a right to bid on behalf of the seller, it shall not be lawful for the seller to bid himself or to employ or induce any person to bid at such sale on his behalf, or for the auctioneer to employ or induce any person to bid at such sale on behalf of the seller or knowingly take any bid from the seller or any person employed by him. Any sale contravening this rule may be treated as fraudulent by the buyer.

Section 22. (Risk of Loss.) Unless otherwise agreed, the goods remain at the seller's risk until the property therein is transferred to the buyer, but when the property therein is transferred to the buyer the goods are at the buyer's risk whether delivery has been made or not, except that (a) Where the delivery of the goods has been made to the buyer, or to a bailee for the buyer, in pursuance of the contract and the property in the goods has been retained by the seller merely to secure performance by the buyer of his obligation under the contract, the goods are at the buyer's risk from the time of such delivery.

(b) Where delivery has been delayed through the fault of either buyer or seller the goods are at the risk of the party in fault as regards any loss which might not have occurred but for such fault.