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 entitled by its own method, namely, by computation and account. For example, in the common case of a contract for the purchase and sale of land, the proper compensation for delay in paying the purchase-money is legal interest on the purchase-money, while the proper compensation for delay in conveying the land is the rents and profits of the land. Accordingly, in a suit by a vendee, if the rents and profits of the land exceed the interest on the purchase-money, the vendee will recover the difference. So, in a suit by the vendor, if the interest on the purchase-money exceed the rents and profits of the land, the vendor will recover the difference. This mode of ascertaining the compensation to which a plaintiff is entitled seems not to require any special justification, as it seems that a jury ought, in most cases, to act upon the same principles in assessing a plaintiff’s compensation by way of damages. In fact, however, equity acts upon a very clear principle of its own, namely, that what ought to have been done shall be considered as having been done. For example, in case of a contract for the purchase and sale of land, if the purchase be completed under the decree of a court of equity, the rights of the parties will be regarded as the same in equity that they would have been at law, if the purchase had been completed pursuant to the contract; or, in other words, the completion of the purchase will be held in equity to relate back to the time when by the contract it ought to have been completed. But if the purchase had been completed at the time stipulated for in the contract, the vendee would have had the use and enjoyment of the land, and the vendor would have had the use and enjoyment of the purchase-money from that time; and hence it follows that the vendor, having had the use and enjoyment of the land when the vendee ought to have had it, must account to the vendee, and the vendee, having had the use and enjoyment of the purchase-money when the vendor ought to have had it, must account to the vendor.

It has been assumed hitherto that the plaintiff alone can recover a compensation for delay in performing the contract; and yet a mutual accounting, on the principles before stated, may result in a balance in favor of the defendant. Shall the defendant in that event recover the balance in his favor? It may be objected, first, that a decree cannot be rendered in favor of a defendant as such, and that, if a defendant would have a decree in his favor, he must file a cross-bill; secondly, that, even if a defendant should file a