Canal rays (or anode rays) are streams of positively charged particles that move towards the negative electrode (cathode) in a discharge tube when high voltage electricity is passed through a gas at very low pressure taken in the discharge tube.
These rays originate as a result of the knockout of the electrons from the gaseous atoms by the bombardment of high-speed electrons of the cathode rays on them. Thus anode rays are not emitted from the anode but are produced in the space between the anode and the cathode.