Colloid Chemistry

THE Chairman of your Program Committee wrote to me that he wished my talk to be a popular presentation which would interest the members who came to the meeting and also a profound discussion which could be read with profit by the eighteen thousand members who decided not to come. Either alternative is a large order and the two are mutually inconsistent, so I am not likely to satisfy anybody. Your Chairman evidently forgot that, if I were to tell you all the things which I consider interesting about the theory of colloid chemistry, I should keep going for several weeks. I give my unfortunate class at least twenty-five lectures at full speed on this very point. I am going to compromise tonight by telling you of a few things which might reasonably be of interest to electrical engineers, without making any attempt to cover the whole ground.