and the action was continued against the executors of his estate and Mrs. Kauffman. The court found in favor of plaintiff, and defendants have taken this appeal.
 Six invoices bearing plaintiff's letterhead and addressed to "Mr. and Mrs. Milton Kauffman" were introduced into evidence by plaintiff. Each of the invoices sets forth an itemized list of household furnishings and their respective prices, with an over-all figure below. At the bottom there appears the statement, "It is understood and agreed that title in above merchandise remains vested in seller until fully paid for," and the word, "Signed," followed by the signature, "Milton Kauffman." The over-all figures on the six invoices total $18,245.42.
 When plaintiff sought to examine Mrs. Kauffman as an adverse party under section 2055 of the Codeof Civil Procedure, the executors objected to her giving any testimony, claiming that she was disqualified as a witness by subdivision 3 of section 1880 of the Code of Civil Procedure.  [fn. *] The objection was overruled, and she testified that she and her husband requested plaintiff's son, Bernard Trabin, to visit their home in Carlsbad with a view to furnishing it at a cost not to exceed $30,000. Bernard Trabin went with Mr. and Mrs. Kauffman to their home where they pointed out the rooms to be furnished and described the kind of furniture desired. Mrs. Kauffman stated that all of the furnishings listed in the invoices were delivered by plaintiff and that the signature on the invoices was that of Mr. Kauffman. She acknowledged that