him with the news. While reading it, he misread 40,000 as 4,000. The mistake became fixed as a paramnesia, so that whenever he told the dream he invariably said 4,000 instead of 40,000. Not until fifteen years later, when he copied out the article, did he discover his mistake. His unconscious knowledge had made the same mistake in reading as himself.

After these general considerations let us re turn to the problem of the empirical basis of synchronicity. T h e main difficulty here is to procure empirical material from which we can draw reasonably certain conclusions, and unfortunately this difficulty is not an easy one to solve. T h e experiences in question are not ready to hand. We must therefore look in the obscurest corners and summon up courage to shock the prejudices of our age if we want to broaden the basis of our understanding of nature. When Galileo discovered the moons of Jupi ter with his telescope he immediately came into head-on collision with the prejudices of his learned contemporaries. Nobody knew what a telescope was and what it could do. Never before had anyone talked of the moons of Jupiter. Naturally every age thinks that all ages before it were prejudiced, and today we think this more than ever and are just as wrong as all previous ages that thought so. How often have we not seen the truth condemned! It is sad but unfortunately true that man learns nothing from history. This melancholy fact will present us with the greatest difficulties as soon as we set about collecting empirical material that would throw a little light on this dark subject, for we shall be quite certain to find it where all the authorities have assured us that nothing is to be found.