Boone v Eyre (1777) 1 H Bl 273 is an English contract law case concerned with substantial performance and conditions precedent.
[1][2] The plaintiff sued the defendant for not paying a £160 annuity (for life) for a plantation in the West Indies that came with a group of slaves, after an initial payment of £500.
Therefore, the defendant was arguing he had the right to terminate the agreement and cease performance.
But where they go only to a part, where a breach may be paid for in damages, there the defendant has a remedy on his covenant and shall not plead it as a condition precedent.
If this plea were to be allowed, any one negro not being the property of the plaintiff would bar the action.