"Tuesday night" "The seventh, which I have just finished...."

"I find the order of the lectures is wrong—I will rearrange them when I have finished. From what you say, I suppose the third and fourth are the most difficult; if so, I had better put them at the end. I think I can build the whole course round the problem of our knowledge of the external world, and bring in Zeno in that connection, toward the end of the course."