A testator went to two persons, told them he had been making his will, and asked them to be witnesses. He produced a paper rolled up in such a way as not to disclose any writing it might contain; and, the paper being so rolled up throughout, the testator signed his name thereon in the presence of the two witnesses, who then signed their names on the paper. The witnesses did not see whether there was any writing above the testator’s signature. The testator afterwards gave the document to his wife to keep, and it was, after his death, found to contain, in his handwriting, what purported to be a codicil to his will.