drew up the opinion of the Court. The first question which the Court has been called upon to consider is, where the dividing line is between the towns of Ipswich and Hamilton. This depends upon the construction of the statute by which the town of Hamilton, formerly making with Ipswich one town, was set off into a separate town. Several depositions were taken and read in the cause, but we have considered them of very little importance, except so far as they show the localities, and thereby show the application of the provisions of this act of incorporation. In regard to these facts, however, there is no contradiction.
The act is the act incorporating the parish of Ipswich Hamlet, in the town of Ipswich, into a town by the name of Hamilton. Si. 1793, c. 10, § 1.
The boundaries, so far as the description affects the present question, are thus described. “ Beginning at Dodge’s stump, so called, where Manchester and Wenham lines meet, thence running westerly, northerly and easterly by Wenham and Topsfieid lines, and by Ipswich river, to a wall about ten chains below Barnabas Dodge’s mills; then by said wall™ &e.
The question depends upon the construction of the clause in Italics. The road crosses the river at a short distance above the mills, called in the act Dodge’s mills, and sometimes called Smith’s mills. At that place, then, the river constitutes the dividing line between the two towns.
It is not denied on the part of the town of Hamilton, who were notified, and who are in effect the parties in interest, that as a general rule, where a boundary line runs by a river, the central line or thread of the river, the jilum aquae, is in tended.
*436But they contend, that by this description, as the boundary is “ by the river to a wall” and this wall is upon the bank of the river, on the Hamilton side, the whole body of the river must be, for some distance at least above this point, within the town of Ipswich, and that at the point where the new bridge is built, the river, by a fair construction, must be taken to be more than one half in the town of Ipswich.
The relative position of the wall and the river are thus described substantially by one who has known them intimately sixty years. The wall being nearly at right angles to the river, continued down towards the river, it ended where there is a stone marked I. H. now standing. That was the end of the wall. From the end of the wall there was a wooden fence about two rods, and beyond that the bank was so steep that a fence was unnecessary. The wall was built as far as the land would admit of its standing strong. It was a broken kind of bank; the wall was built, until the wall beyond began to fall or pitch. I understand that the stone above named marks the spot designated in the act of incorporation as “ the wall,” and stands on the brow of the bank on the Hamilton side of the river a few rods from the water.
Upon these facts, how does the boundary line run, as contemplated by the statute ? So far as it runs “ by the river,” which is understood to be for a considerable distance above Dodge’s mills and above the new bridge, it must be governed by the general rule, the central line of the river, to be ascertained, in the usual manner, at each particular point of the river, in regard to which the question may arise. But the question is, where does the line leave the central thread of the river, and cross the right bank of it to the wall ? We think it very clear, that it must at a point directly opposite to the end of the wall; or at that point at which the line of the wall, if protracted at right angles with the river, would "ntersect the central line of the river.
The description in the statute cannot literally apply, because a line extending and continuing by the river, can never actually touch the wall, at three rods from it. It must therefore have a reasonable construction, in order to carry into effect the intent of the legislature. This both parties admit; *437one contending that it leaves the thread of the river, at some indefinite point above the mills and the bridge, and runs by a very acute angle, to the end of the wall, where the bound stone now stands ; the other party insisting that it must follow the thread of the river until that description becomes inapplicable, and it is necessary to leave for the wall which is the bound given, and that is at a point opposite to the wall. And we are of opinion that the latter is the most reasonable and probable construction, and therefore the one intended by the legislature.
Several reasons favor this construction.
As the legislature assumed the river as a natural and convenient boundary, it is to be presumed that that boundary was to be continued as far as it could be, that is, as far as the river runs in the same direction in which it was intended that the new town should extend.
Again, as the description in the act of incorporation is incomplete and leaves a hiatus to be supplied, that construction seems most to comport with the intention of the legislature, which leaves the defect in the line described the shortest and smallest.
It seems probable that the end of this wall was taken as the nearest permanent object, and the nearest point at which a permanent monument could be fixed ; it being inconvenient to fix a permanent bound mark in the water, or upon the precipitous banks of the river. This is the more probable, as the line was here to take a new direction, and that direction was to be given by the course of this wall.
The other construction seems to have nothing to recommend it. If the line might leave the centre of the river and take a direction diagonally towards the wall at ten rods above, why not at fifty or a hundred or a mile above ? It would render that part of the description u by the river,” vague, indefinite and ambiguous, and that without necessity or use.
The difficulty has probably arisen from a slight inaccuracy-in the wording of the description. Had it said, by the river to a point in a line with the wall &c., and thence by the wall &c., it would have precluded all doubt. As it is, we think *438the meaning is the same, and as something must be supplied by construction, this construction will most effectually accomplish the purpose of the legislature.
From this view of the question of boundary, it follows as a necessary consequence, that all the expense of constructing that part of the bridge which lay on the south side of the central line of the river, was properly chargeable to the town of Hamilton, and that part only which lay on the northerly side of the same line, was chargeable to the town of Ipswich ; and it was not only competent to, but necessary that the commissioners should ascertain and determine the boundary line between the two towns, so far as this question was concerned, as incidental to a just and legal apportionment of the expense. The statute is express, that where the commissioners have caused the work, which the towns ought to have done but have failed to do, to be done and paid for out of the county treasury, they shall give notice of the expense to the delinquent towns and the part thereof which each town is to, pay. St. 1827, c. 77, § 7. The object is. to reimburse the county, and to compel each town to pay for what it originally ought to have done at its own expense, and in the not doing of which it is delinquent, and that is, to repay all the expense of doing the work within its own limits. When therefore the commissioners are required to apportion this expense, they must necessarily determine 'what proportion of the expense was incurred upon one side, and what upon the other side of the boundary line, and of course where that line is. Such decision would be conclusive only to the extent of the subject matter before the commissioners.
Considering that it is apparent from the proceedings and the answer of the commissioners, that they did not ascertain and decide upon the boundary line, before making the ap portionment of the expense of the bridge, which crossed that dividing line, and which was an expensive structure, and consequently that the expense may not have been justly and legally apportioned, we are of opinion that the proceedings of the commissioners in directing a warrant of distress at their session in October last, and also their proceedings making the apportionment at their session in July last, are erro-
*439neous and ought to be quashed, and that a writ or writs of ? , certiorari issue lor that purpose.
Another question was raised and discussed, upon which it seems proper to express an opinion.
The provision of the statute already cited is, that if the towns whose duty it is to make the roads and bridges required, shall not make and complete the same, within the times and in the manner prescribed by the commissioners, the commissioners shall cause the same to be completed and at their next regular meeting shall order the expense thereof to be paid out of the county treasury and shall order notice thereof to be given to the towns so delinquent, and the part thereof which each is to pay. And if such town do not before the next regular meeting pay &c., the commissioners shall issue a warrant or warrants &c.
The argument at the hearing was, that as these proceedings were to be had at the next regular meeting, the power of the commissioners to apportion these expenses upon the towns and cause a reimbursement thereof to the county treasury, was limited to such next regular meeting, and that if these proceedings were not then had, the expense in question must remain as a charge upon the county, and the commissioners would have no authority to apportion it upon the towns.
But the Court do not so understand the provisions of this statute. The great object and purpose of the act was, to secure the prompt and immediate performance of the duties of towns in the construction of highways, adjudged to be of common convenience and necessity, to give the towns an opportunity to construct them by their own labor and means, if they would do so without delay, but on their failure it was not intended to await the slow and uncertain process of penal laws, but to cause the work to be done at the expense of the towns charged with the duty. This object would often be defeated, upon the construction contended for. But we are of opinion that the provision of the statute requiring notice &c. at their next regular meeting, is directory to the commissioners, not restrictive of their powers. If therefore, from any cause, these proceedings cannot be *440had at the next term, or if, as in the present case, they should be quashed for irregularity, it is competent to the commissioners to make a new apportionment, and order for payment, and upon failure, to issue a warrant of distress, pursuant to the statute.
And the Court are further of opinion, that after the records of the two orders have been brought into this Court, and the proceedings thereon quashed, it will be competent for the commissioners to make a new order of apportionment ; and if necessary, a writ of mandamus from this Court may issue to the commissioners requiring them to proceed and make such order.