This rule has been seen as an anomaly. It is suggested that a carrier's failure to deliver goods in accordance with his contract is simply an illustration of a res ipsa loquitur: that it is an evidentiary fact from which, in the absence of an explanation, an inference can be drawn of default on the part of the carrier, but that the ultimate onus is upon the plaintiff and that it never shifts. This proposition would be irrefutable if the rights of the parties depended simply on a contract to carry with due care. But that, it seems, is not so when goods having been delivered into his custody, the carrier has assumed the duties of a bailee for reward. An explanation of the apparent anomaly may well be that the duty of a bailee to use due care does not arise from contract or from tort. It could in former times have been asserted in either assumpsit or in case: but it is now generally recognized as sui generis. If the matter be put in terms of an implied undertaking or promise by the bailee, it is that he will re-deliver the goods to the bailor or whoever he appoints to receive them, except he, the bailee, be prevented from doing so by events not caused by negligence on his part, proof of the exception being upon him. Seen in this way, the burden that is put upon a bailee of exonerating himself when he fails to re-deliver the goods is simply a peculiar incident of the law of bailment. I accept the analysis that Sholl J. made after a survey of the authorities in his judgment in Fankhauser v. Mark Dykes Pty. Ltd. [3] . I appreciate that the second count of the plaintiff's declaration tenders an issue of fact to be proved by the plaintiff. I realize too that to say that the bailee must exonerate himself when the facts raise a prima facie inference of negligence may well seem anomalous when set alongside the doctrine that this Court has established for Australia of the onus of proof in cases when res ipsa loquitur is put forward: as in Anchor Products Ltd. v. Hedges [4] . And I recognize that some judgments in which the onus is said to be on the carrier to negative negligence are equivocal. For example, in the New Zealand case to which I have referred Reed J. placed the onus of proof on the carrier, quoting the decision of the New Zealand Court of Appeal in Aurora Trading Co. Ltd. and Jackson v. Nelson Freezing Co. Ltd. [5] . Yet he went on to refer [6] to cases in which "a reasonable explanation of the loss was given, which caused the onus to shift to the plaintiff to establish negligence. And that no doubt", he said, "is the law". And in the United States there have been cases in which a loss of articles bailed has been taken to be a res ipsa loquitor. One explanation that has been put forward is that an inference of negligence arises if the loss be not explained by the bailee, the burden of adducing explanatory evidence being on him because the facts are peculiarly within his knowledge and not within the knowledge of the bailor. However, despite all these countervailing considerations I think that the rule as to the onus, being an incident of the law of bailment, is too firmly established to be shaken by demands for logical consistency with the consequences of res ipsa loquitur in other circumstances.