Read it through once

In this old manuscript you will find mention of an extraordinary experience of mine in the mental telegraphic line, of date about the year 1874 or 1875—the one concerning the Great Bonanza book. It was this experience that called my attention to the matter under consideration. I began to keep a record, after that, of such experiences of mine as seemed explicable by the theory that minds telegraph thoughts to each other. In 1878 I went to Germany and began to write the book called _A Tramp Abroad_. The bulk of this old batch of manuscript was written at that time and for that book. But I removed it when I came to revise the volume for the press; for I feared that the public would treat the thing as a joke and throw it aside, whereas I was in earnest.