Abstract :
R. W. Sorensen: Professor Ryan says, “There are two varieties of electrons, positive and negative.” On this he can find much authority; in fact in his book, “The Electron,” Dr. Millikan speaks of positive and negative electrons, but I much prefer in this particular to follow the practise of those who define the electron by saying it is a cathode particle such as is found in the cathode rays. I choose this path of thinking about electrons because we all know something about cathode rays. These rays have been found to be made up of negatively changed particles, and the particles are called electrons.
