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In this paper an apparatus is described for polymerizing monomers in bulk up to a pressure of 10000 atmospheres and in which the polymerizing substance can be heated and the temperature of the substance measured. Styrene shows an explosive reaction at 10000 atmospheres and at about 70°C. Indene polymerizes slowly when heating at 10000 atmospheres and shows an explosive reaction at 175°C. Both compounds give a solid polymer. Crotonaldehyde heated at 10000 atmospheres gives a brittle, high‐melting polymer. Coumarone and some chlorinated ethylenes carbonize when heated at 10000 atmospheres. Butyraldehyde polymerizes to a solid product which rapidly reverts to butyraldehyde.