A deed of guarantee physically incorporated in a contract of sale forms a single composite instrument that must be construed as a whole. Where the deed leaves blank the name of the principal debtor, the identity of that debtor may be ascertained from the contract of sale, and the deed is not void for uncertainty. The general rule that a deed with a material blank is void is subject to a qualification: if the language is sufficient without filling the blanks to ascertain the intention of the executing party, the deed is valid as it stands.
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