Bankruptcy Rules

The proxy of a creditor blind or incapable of writing may be accepted if such
            creditor has attached his signature or mark thereto in the presence of a witness, who
            shall add to his signature his description and residence, and provided that all
            insertions in the proxy are in the handwriting of the witness and such witness has
            certified at the foot of the proxy that all such insertions have been made by him at the
            request of the creditor and in his presence before he attached his signature or
            mark.