Harry Brown purchased a $15,000 certificate of deposit at Hutchinson National Bank (P). It was issued in the name of him and his wife Ida as joint tenants. The grandson of Harry applied for a loan and Harry agreed to pledge the certificate of deposit. Harry died six months later. Two years later the grandson applied for bankruptcy and P sued Ida (D) for the security pledged. The district court ruled that the pledge of the certificate did not sever the joint tenancy and that D had no duty to inform P that she did not consent and the certificate passed to D free and clear on Harry's death. Judgment was given D. P appealed.