The simplest application of these rules is seen when the thing delivered to the workman is a single chattel. But, of course, a thing may consist of several components. In such a case, although possession of a part of the thing be abandoned, the workman may yet retain the rest as security for the reward he was to have for doing work on the whole thing. The question is what was the thing or entity upon which the work was to be done. For example, if a pair of boots be delivered to a cobbler for repair and he for some reason allows the owner to take away one boot before he is paid, he may still refuse to deliver the other until he be paid the price of repairing the pair. Similarly, if a bookbinder contracts to bind a work consisting of several volumes he can maintain a lien over one volume for the whole price, notwithstanding that he had delivered the other volumes. It is not necessary to go through the authorities that were cited to us. Some of the earlier ones show that, at one period, the courts were inclined to approach the question by asking whether the usages of a particular trade or the circumstances of a particular case justified a general lien as distinct from a particular lien. But, notwithstanding Lord Ellenborough's statement of the printer in Blake v. Nicholson [1] that "the nature of his work affords a reason for his general lien", the lien asserted was in reality a particular lien and the basis of the decision is that stated by Bayley J.: "He does a certain portion of one entire work". All the decisions are referable to the same principle. As long ago as 1754 the question arose in a contest between the assignee of a bankrupt and a person claiming a lien, and it was resolved by Lord Hardwicke in favour of the assignee: Ex parte Ockenden; Re Matthews [2] . Except in trades and callings where the law recognizes that by usage general liens exist, a lien for work done upon goods is a particular lien only. It attaches to the thing, or to a part of the thing, on which work was done. It is not essential to the creation of a particular lien that every part of the postulated thing be delivered at the one time. But, if there be separate deliveries, they must not be of separate things but of several parts making up the whole thing on which work is to be done. That thing may be a single chattel or a specific quantity or parcel of goods. But for a particular lien to attach, the subject matter of the work must always be something that the parties treated as an entirety in their dealings with one another concerning the work to be done on it.