12 As will become apparent from the authorities discussed below, that proposition states the position rather too widely. Whether a farmer loses title to wheat upon a baker turning it into bread depends, fundamentally, on the legal relationship between the farmer and the baker, which may be a contract for sale of goods, or may be a contract for services. Some of the complexities are adverted to by Bryson J in Associated Alloys Pty Ltd v Metropolitan Engineering & Fabrications Pty Ltd (1996) 20 ACSR 205, (at 209):
The question whether goods which have been used in some manufacturing process still exist in the goods produced by that process, or have gone out of existence on being incorporated in the derived product is, in my opinion, a question of fact and degree not susceptible of much exposition. When wheat is ground into flour it is reasonably open to debate whether the wheat continues to exist; when flour is baked into bread there could be little doubt that the flour does not. Many examples might be encountered or imagined, and each must be addressed separately. Where goods of a homogenous character are mixed co-ownership might be a correct conclusion; but that is a problem of a different kind. There is some discussion in the judgment of Bridge LJ in Borden (UK) Ltd v Scottish Timber Products Ltd [1981] 1 Ch 25 at 41; [1979] 3 All ER 961, addressing "a mixture of heterogeneous goods in a manufacturing process wherein the original goods lose their character and what emerges is a wholly new product …". Goff LJ in Clough Mill Ltd v Martin [1985] 1 WLR 111 at 119; [1984] 3 All ER 982 said: "Now it is no doubt true that, where A's material is lawfully used by B to create new goods, whether or not B incorporates other material of his own, the property in the new goods will generally vest in B, at least where the goods are not reducible to the original materials: see Blackstone's Commentaries , 17th Ed (1830), vol 2, at 404-5."
13 It is well established that a bailment may involve an obligation to return the goods in an altered form. Halsbury's Laws of England, 2nd edition, cites the definition of bailment in Bacon's Abridgment, in which it was said (emphasis added):
A bailment, properly so called, is a delivery of personal chattels in trust, on a contract, express or implied, that the trust shall be duly executed, and the chattels redelivered in either their original or an altered form , as soon as the time or use for, or condition on which they were bailed, shall have elapsed or been performed.
14 This statement was cited by Cohen J in Re S Davis & Company Ltd [1945] Ch 402 (at 405). The same concept is apparent in the judgments of Rich and Starke JJ in Chapman Bros v Verco Bros & Co Ltd (1933) 49 CLR 306. Rich J said (at 314) (emphasis added):
The arrangement is inconsistent with the very idea of bailment according to English law, which involves the redelivery of a specific thing in its original or some altered form to the bailor or to some other person in accordance with the terms of the bailment.