The rates of formation of pyrolysis products, identified by gas-liquid chromatography, of copolymers of methyl methacrylate with purem- and with purep-divinylbenzene show that the products derived from the meta-disubstituted unit in the meta cross-linked copolymer appear more rapidly than do those from the para-disubstituted units. This confirms the similar observation with corresponding styrene copolymers. The data from the methacrylate copolymers provide a less complicated degradative pattern, since depolymerization is the principal degradative process. The analytical data are less complicated also. The basic assumption that the relative rates of appearance of the disubstituted fragments are related to the distribution of the divinyl derived units in the network is, therefore, strengthened.