Abstract
In the course of college lecture it is important to summarize what polarography is and to point out its characteristics. The characteristics of polarography are pointed out as follows : polarography is a) a part of chemistry in solution, b) chemistry in electrode reaction, that is, reduction-oxidation system and c) chemistry in heterogeneous system, and d) polarisation is most important in polarography. As for the concepts of currents in polarography, it is easy for students to understand diffusion current but not migration current in diffusion layer. The latter is clearly explained in figures 4 and 5. By way of this explanation it must be emphasized that migration current is due to migration froce in solution, but the current itself is electrolytic current. That is, migration current is due to migration in solution and electron transfer at the surface of electrode, so that it is also faradaic current.
