The ultra-violet absorption spectra of the vapours of many compounds containing the carbon-iodine bond are continuous. This is interpreted in terms of photo-dissociation of the C-I linkage. Photochemical reactions of iodobenzene and iodoacetic acid support this interpretation. New experimental observations include measurements on the absorption spectra of iodobenzene vapour, which condnn the view that the continuous absorption band obtained in solutions is not due merely to the influence of the solvent molecules. Experimental results are also recorded on the ultra-violet absorption spectra of iodoacetic acid, sodium iodoacetate, ethyl ,9-iodopropionate, and 3-iodopropaldehyde.

Reactions of oxygell activated by electrical discharge with butene-1 have beer1 studied in a "spherical diffusion" reaction zone. When snlall concentratiorls of oxygen are passed through the discharge tube in helium as the carrier gas, and the concentration of butene-1 in the reaction zone is sufficiently high, the observed products are entirely explainable by an interaction of the ground-state oxygen atoms with butene-1. With large deviations from these conditions considerable complexities arise, and under some conditions a-butylene ozonide and its decomposition products become important and the products are then explainable without any significant participation of oxygen atoms in the process.

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The liquid phase photolysis of tetrachloroethylene in cyclohexane has been investigated. The primary process is the dissociation of tetrachloroethylene into C2Cl3 radicals and chlorine atoms. The main product (formed by a chain mechanism) is trichlorovinylcyclohexane and the chain carrying species are chlorine atoms. Other products include cyclohexyl chloride, dicyclohexyl, trichloroethylene and tetrachloroethyl‐cyclohexane. A reaction mechanism that satisfactorily explains the kinetics has been postulated.The photolysis has also been examined in cyclopentane and the results obtained are compared to those for cyclohexane. The differences in reactivity of cyclohexyl and cyclopentyl radicals are discussed.