another date as part of a refinancing in which these bonds were retired and a single mortgage loan substituted by the Corporation in their place. Since they were not redeemed on an "interest payment date", under the plain language of the instruments interest beyond the preceding April 15th was not due.


8
Appellants urge that the general promissory clause of the bond said that interest would be paid "until payment of said principal amount". But, so far as that general promissory clause was concerned, the bonds could not have been redeemed; the whole matter of redemption was treated in another clause of the bond. The general promise was to pay on April 15, 1950. The promissory clause, summarized, provided that the Corporation promised to pay Blank on April 15, 1950,by the section we have quoted first hereinabove. The whole of the bond must be looked to. Moreover, even the redemption provision on the face of the bond made no reference to interest. It provided redemption "at the principal amount thereof." But it referred to "the terms provided in said Indenture". The provision for interest upon redemption was in the indenture. That document was not so separate from the bond that it could be overlooked. It was referred to in the promissory clause itself in connection with the interest and was elsewhere mentioned twelve times (in every paragraph except one) on the face of the bond. The clause of the indenture dealing with interest upon redemption, and not the general promissory clause of the bond, is the controlling