Additional letters, dated the same as the above, and which are referred to as “riders” to the contract evidenced by the above letter, are as follows:
“September 21, 1921.
“Spitzer, Rorick & Co., Toledo, Ohio—Dear Sirs: In consideration of the contract of sale this day entered into by us, wherein we sell you bonds of North Dakota real estate series, and option to you bonds of North Dakota, mill and elevator series and home building series, noted in said contract, we hereby agree to pay you at the time of each consignment of said bonds is taken up and paid for by you, including these on which you may exercise your option three points (three per cent. on par) on bonds real estate series sold in said contract, amounting to approximately five million two hundred eighty thousand dollars ($5,280,000) and two points (two per cent. on par) on all bonds optioned in said contract except the six per cent. mill and elevator series, amounting to approximately five hundred ninety thousand dollars ($590,000).
“This agreement is attached to and made a part of the original contract referred to herein between the parties hereto.
“Bank of North Dakota, “By F. W. Cathro, Manager.”
“September 21, 1921. “We hereby confirm the. foregoing agreement in all respects and hereby faithfully agree to carry out the same. “Spitzer, Rorick & Co., . “By A. V. Foster.”
“September 21, 192I.
“Spitzer, Rorick & Company, Toledo, Ohio—Dear Sirs: In consideration of the contract of sale this day entered into by us, wherein we sell and option to you the bonds of North Dakota noted in said contract, we hereby agree to pay you at the time each consignment of bonds is taken up and paid for by you, including those on which you may exercise your option, two points (two per cent. on par) on all bonds delivered to you during the life of said contract, said two points to be in addition to the payments specified in that certain rider contract which, together with this agreement, is attached to and made a part and a portion of
