"These work pages show how I devise solutions to single-word or brief changes required by either error or infelicity in the galleys. Resetting costs are abominable these days, and if the author introduces a new word at the beginning of a paragraph he causes the entire paragraph of many lines to be reset, and the charge is levied on him. It is therefore to his interest to make only such changes---except where raw error is involved---as can be fitted into the rigorous limitations of the cast-metal type line. I have grown fairly expert at this, but casual onlookers sometimes are appalled that a writer would so confine himself. When such critics have remonstrated with me I remember the experience of Mark Twain, a fairly good yarn-spinner. One of his lines read 'We got our canoe and proceeded on our way down river.' A nit-picking editor pointed out that at the end of the preceding chapter Twain had described in vivid detail how Tom and Huck had lost their canoe in a fire. What to do? Like any professional, Twain was equal to the task, and his solution was a most happy one: We got our canoe and proceeded on our way down river. We found a canoe and proceeded on our way down river."