Here's another excerpt from p. 13. Again, remember that this book is from 106 years ago, so telephones were the height of communications technology, radio was called "wireless telegraphy", and there was no CIA or KGB to blame these experiences on; "a professor" was the closest equivalent.
> The patients frequently connect them [their strange experiences of hearing voices and feeling that others can read their thoughts] with malevolent people by whom
they are "watched through the telephone," or connected up by wireless telegraphy or by Tesla currents. Their thoughts are conveyed by a machine, there is a "mechanical arrangement," "a sort of little conveyance," telepathy. A patient said, "I don't know the man who suggests that to me." Another supposed that it might perhaps be done for scientific purposes by a professor. A third explained, "I am perfectly sane and feel myself treated as a lunatic, while hallucinations are "brought to me by magnetism and electricity."
> The patients frequently connect them [their strange experiences of hearing voices and feeling that others can read their thoughts] with malevolent people by whom they are "watched through the telephone," or connected up by wireless telegraphy or by Tesla currents. Their thoughts are conveyed by a machine, there is a "mechanical arrangement," "a sort of little conveyance," telepathy. A patient said, "I don't know the man who suggests that to me." Another supposed that it might perhaps be done for scientific purposes by a professor. A third explained, "I am perfectly sane and feel myself treated as a lunatic, while hallucinations are "brought to me by magnetism and electricity."