In Estate of Abdale (1946) 28 Cal.2d 587, husband conveyed his separate property to himself and his wife as joint tenants, and the wife subsequently died, vesting title in the husband as surviving joint tenant. Upon his death, the court traced the origin of the property to the husband and rejected the argument that the wife had acquired a separate property interest for purposes of section 229. Holding that section inapplicable, the court determined that decedent's heirs succeeded to the subject property and the heirs of the predeceased spouse took nothing.