Cl³⁴ was obtained from a gamma reaction upon ordinary chlorine and its radiation to determine the decay scheme. Three positron components were separated from the beta spectrum of Cl³⁴ obtained from an intermediate-image spectrometer. Coincidence beta spectra obtained with the use of the same instrument gave additional energy determinations for the two lower-energy beta groups as well as indicating the time relationships between the beta groups as well as indicating the time relationships between the beta ray and the gamma rays in Cl³⁴. The low energy gamma ray in Cl³⁴ was studied by means of its internal conversion peak. The 1.1 Mev and 2.1 Mev gamma rays were measured from photographs of the Cl³⁴ gamma scintillation pulse distribution. The decay scheme indicated from the results was completed with the use of beta log ft values and gamma lifetime values for the spin and parity assignments given to the nuclear energy levels.