of the offprint) says quite rightly: 'But perhaps it is altogether quite mistaken to correlate a wave with one single photon a kind of physical action (a reduction of wave packets) is exerted from the place where the reﬂected half of the wave packet is found upon another place as distant as we choose where the other half of the packet just happens to be'; a description to which he adds: 'this physical action is one which spreads with super luminal velocity.'