...performance of the stipulations of this agreement on the part of the party of the second part, the party of the first part agrees to pay, or cause to be paid, to the said party of the second part quarterly, on the presentation of proper receipts or vouchers in triplicate, duly approved by...

...the said Thomas H. Armstrong, his heirs, executors or administrators, shall well and truly pay, or cause to be paid, to the said party of the second part, his heirs, executors or assigns, the sum of $500, with interest, * * * and also pay all taxes which may be hereafter assessed...

...party of the first part, his heirs, executors, administrators, or assigns, shall well and truly pay, or cause to be paid to the said party of the second part, his heirs, executors, administrators, or assigns, the sum of dollars, according to the condition of certain [bond or note]...