In the cathode ray production experiment, at about .01 mm of Hg, cathode rays travel from cathode and move towards anode and produce fluorescence on the walls near the anode.At the same time canal rays also move towards cathode. But only when you use a perforated cathode, the canal rays penetrate through it and produce fluorescence at the back of the cathode. I have doubts on the following aspects of the above experiment. We are not using any perforated anode in the case of cathode ray production. Still these rays are able to produce fluorescence on the walls near the anode, thus indicating their presence. But why, the canal rays or the anode rays, so to speak, do need a perforated cathode to reach the other side and produce glow on the fluorescence screen kept at the back of the perforated cathode? Can not the anode rays make the walls near the cathode, glow even with out a perforation in the cathode, as the cathode rays did? As I am not able find the reason for it, it will be of great help to me if some experts on the subject throw some light on this aspect.