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 to suppress one of them successfully. But once it is agreed by all astronomers that the earth goes round the sun, it is a hopeless task for any authority to compel men to accept a false view. In short, because she is in possession of a vast mass of ascertained facts about the nature of the universe, reason holds a much stronger position now than at the time when Christian theology led her captive. All these facts are her fortifications. Again, it is difficult to see what can arrest the continuous progress of knowledge in the future. In ancient times this progress depended on a few; nowadays, many nations take part in the work. A general conviction of the importance of science prevails to-day, which did not prevail in Greece. And the circumstance that the advance of material civilization depends on science is perhaps a practical guarantee that scientific research will not come to an abrupt halt. In fact science is now a social institution, as much as religion.

But if science seems pretty safe, it is always possible that in countries where the scientific spirit is held in honour, nevertheless, serious restrictions may be laid on speculations touching social, political, and religious questions. Russia has men of science inferior to none, and Russia has its notorious censorship. It