"... if you mean to rely on contract with the individual, you do not need to give notice; from the moment of the contract, he, with whom you are dealing, is personally bound. But if you mean to go further, and to make your right attach upon the thing which is the subject of the contract, it is necessary to give notice; and, unless notice is given, you do not do that which is essential in all cases of transfer of personal property. The law of England has always been, that personal property passes by delivery of possession; and it is possession which determines the apparent ownership. If, therefore, an individual, who in the way of purchase or mortgage, contracts with another for the transfer of his interest, does not divest the vendor or mortgagor of possession, but permits him to remain the ostensible owner as before, he must take the consequences which may ensue from such a mode of dealing. ... If you, having the right of possession, do not exercise that right, but leave another in actual possession, you enable that person to gain a false and delusive credit, and put it in his power to obtain money from innocent parties on the hypothesis of his being the owner of that which in fact belongs to you. The principle has been long recognised, even in courts of law. ... one of the badges of fraud was, that the possession had remained in the vendor. Possession must follow right; and if you, who have the right, do not take possession, you do not follow up the title and are responsible for the consequences." (Sir Thomas Plumer MR)