IN a communication bearing this title, and when referring to our papers1 on the uncrystallizable compound (m.p. 311–312°) formed during the course of the reaction which takes place between anethole and maleic anhydride, Bruckner and Kovacs2 state that we have not recognized that this compound was a heteropolymer. In a series of other reports on the same subject published later, the heteropolymer character of the compound was established and, furthermore, its molecular weight was determined3 with the help of the cis-hexahydro-para-aminobenzoic acid lactam4. The product which is obtained first under Bruckner's working conditions and our own, when refluxed with chloroform, yields two compounds, one of them soluble (m.p. 245° decomp.), with a molecular weight equal to 738 (theoretical for 3: 3·735), and the other insoluble (m.p. 310° decomp.), with a molecular weight equal to 1,010 (theoretical for 4: 4.980).