Parol or written testimony, other than the instrument of assignment, is admissible to show what debts are due, and under what circumstances, to those who are there provided for. But the meaning and true construction of the terms used in the assignment must be determined from what is there written. They cannot be waived, explained, or extended by parol testimony. The correctness of this rule is strongly illustrated, by the extraneous evidence received at the trial, subject to the opinion of the Court. The witnesses are not agreed as to what passed between the parties, or what intentions they expressed in regard to the subject under consideration. Upon this point, wbat they have written must remain as the best and only evidence of what has been agreed.

All sums due to the assignees, or either of them, were to be paid in the first class. Peter W. Morrill is one of them, and the case finds that there was a debt due from Pobinson, the insolvent debtor, to him, and another to him and his partner Knox, and one of the questions submitted is, whether both these debts are to be considered as falling wfithin the same class. Provision is next made to pay all debts due to certain other persons named in the assignment, of whom William Cobb is one. It appears that no debt was due to William, Cobb alone, but that one was due to William Cobb fy Company. And it is agreed, that if that debt is provided for in the second class, under the name of William Cobb, and the debt due to Morrill and Knox is to be placed upon the same footing with that due to Morrill alone, the plaintiffs have not maintained their action. A just construction requires that, effect should be given to every part of an instrument, subject only to be controlled and modified by a general view of the whole. When provision is made for William Cobb, it must be understood to have had some meaning. It is apparent, that in the contemplation of the parties there was some debt, upon which it was to operate. If we hold it inoperative, their intentions in this part of the instrument are defeated. This part of it can be satisfied only by the debt due to William Cobb Company, which we are clearly of opinion it must have intended to embrace. If we can ascertain the meaning of parties, although there may be a want of precision and exactness in the terms in *60which it is expressed, effect is to be given to it. It is manifest here, that they did not accurately distinguish between debts due to a firm from those due to the individuals of which it was composed. The same reasoning applies to the debt due to Morrill and Knox, although not with equal strength, because there was a debt due to Morrill alone. But we think, upon the whole, the same construction must be given to both. It is insisted that those only are entitled to be paid in the first class who are assignees, and that Knox is not assignee. It is not to be paid because due to him, but because it was due to Morrill, and all sums due to him are expressly provided for. The debt due to Morrill and Knox was as much due to Morrill, as the debt due to Cobb Sf Co. was due to Cobb, and that the parties intended to provide for this last debt, although Cobb alone is mentioned, cannot admit of question. As these debts, with others not in dispute, exhaust the fund, the defendants have nothing in their hands which can be claimed by the plaintiffs.

Judgment on the verdict.