In a previous paper, 1) observations of the behavior of representative aliphatic olefins in their thermal condensation with formaldehyde were reported. It seemed desirable to extend this research by examining also the thermal condensation of some cycloolefins with formaldehyde. The present paper will describe the products obtained from ƒÀ-pinene, camphene, thujopsene, dihydrothujopsene, 3-pmenthene, cyclohexene, 1-butyl-2, 6, 6- ...