delivered the opinion of the Court.
The first question presented by the report is as to the proof of the defendants’ seisin of that portion of the premises described in their third plea.
Upon this point the only proof that was introduced came from the *231plaintiff; by which it appeared that the defendants owned and occupied a lot bounded by a fence vvhich separated it from a road running on the easterly bank of Mousum river. Who owned the fee in the land occupied as a road, does not appear. The case shows that the defendants did not claim it. They were bounded by the line of the road farthest from the river, and there was no proof of any occupancy or possession by them west of their line, excepting that a part of the road was for a time inclosed in common with the pasture, by arrangement between the defendants and the selectmen of the town. This and the repairing Gilpatrick’s fence on the westerly bank of the river is far from proof of an appropriation or possession of the water privilege or any part of the river or the shore thereof. We see nothing in the evidence reported which looks like a seisin in fact by the defendants or any intention to occupy and improve the whole grist mill and privilege, and the eastern half of Mousum river to the channel at the time of making their deeds to Varney.
The next question is upon the admissibility of the rejected evidence. The plaintiff offered to prove an eviction by paramount title, to support the allegation of breach of the covenant of warranty, and also to prove the damages which he had sustained by reason of such breach*. Such proof would have been relevant if he had succeeded in proving the defendants’ seisin of the premises at the time of the execution of the deed; but failing to do this, the case left him nothing on which the covenant of warranty could operate. No land had passed by virtue of the deed, and consequently there was nothing to be defended.
Was the nonsuit properly ordered ? Where the plaintiff does not set forth a good ground of action, the defendant is not bound to answer. So whore the plaintiff wholly fails to prove his material allegations the defendant is not put to his proof but may call for a nonsuit. Where there is contradictory testimony it is the exclusive province of the jury to settle the facts. What was there to be settled by a jury in this case ? As the issue was made up, it was incumbent on the plaintiff to prove that the defendants were seised in fact as he alleged. He did prove certain facts which were not do*232nied by the defendants. Whether those facts amounted to seisin was a question for the Court. The Judge ruled at the trial, and we think correctly, that they did not show a seisin in fact by the defendants, and of course they could not be required to defend further on the alleged breach of the covenant of warranty.
As to the covenants of seisin and good right to sell and convey, the plaintiff, as assignee had no such interest in them as could enable him to maintain an action in his own name for their breach. They were broken at the time of executing the deed to Varney, and the right to recover damages for their breach vested immediately in him, and could not be assigned so as to enable the assignee to maintain an action for their breach in his own name. This doctrine is supported by the uniform current of American authorities $ and is too well settled here-to be shaken by the recent decisions to the contrary in England.
The declaration and pleadings, in this case, present the litigating parties in somewhat of a novel situation. The plaintiff in alleging a' breach of the covenant of seisin, and of good right to sell and conyey, virtually alleges that the defendants were not seised in fact, for if so seised, whether by right or wrong, it would be sufficient to support these covenants. They are negatived in the declaration, that is, the declaration virtually alleges that the defendants were not seised in fact, and had not good right to sell and convey. The defendants, by their plea, admit that they had no such right. To this the plaintiff replies directly against the legal effect of his allegation in the declaration, .thtj-t the defendants were seised in fact 5 and the defendants rejoin that they were not so seised. The result of these pleadings is such, that when the issue is formed, the plaintiff is in effect denying his own allegation, and the defendants admit it. The settled rule of pleading is that the replication must not depart from the allegations set out in the declaration, in any material matter, and, the reason given for it is, that if parties were permitted to wander from fact to fact, and to supply anew 'cause of action as often as the defendant should interpose a legal bar to that which the plaintiff first set out, it would lead to endless prolixity.
*233If the covenants of seisin, and good right to sell and convey have been broken, as the plaintiff alleges in his declaration, they were broken at the time of the execution of the deed to Varney, and if so, no estate or interest passed to him or his assignees to which the covenant of warranty could be annexed,: That covenant runs with the land conveyed, and descends to heirs, and vests in assignees 'with the land, whenever that passes. But when the covenant of seisin is broken, nothing passes by the deed, and, the substratum having failed, the covenant of warranty cannot descend to the heir, or vest in the assignee. It cannot run with the land, for none having been conveyed there is none for it to run with.
It is therefore manifest that if the defendants were not seised and had no right to sell and convey when they executed the deed, as the plaintiff alleges in his declaration, their covenant of warranty does not vest in the plaintiff as Varney's assignee. That being the case, the plaintiff, by his own showing, has no cause of action for breach of the- covenant of warranty, for in the same count in which he alleges a breach of that covenant he also alleges a breach of the covenants of seisin and good right to convey, and the defendant ad mits it.
Motion to take off ihe nonsuit denied.