Remarks on Possible Noninvariance under Time Reversal and Charge Conjugation

'N a recent paper' the question has been raised as ~ to whether the weak interactions are invariant under a space inversion. It was also pointed out there that similar to the situation for space inversion there exists at present no experimental proof that weak interactions are invariant under charge conjugation. Consequently the absolute invariance under charge conjugation is also an open question. The present note is devoted to a study of questions concerning the invariance under charge conjugation C, and under time reversal T (which is defined to be the Wigner time' reversal. It does rot switch a particle into its antiparticle; nor does it change the sign of the spatial coordinates).