law: Sale of Goods Act, 1930
  23. Sale of unascertained goods and appropriation
  (1) Where there is a contract for the sale of 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) Delivery to carrier- Where, in pursuance of the
  
  contract, 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
  
  the buyer, and does not reserve the right of disposal, he is deemed to have
  
  unconditionally appropriated the goods to the contract.