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1. If nothing goes wrong he will be back in a fortnight. 2. This fact points to the postulated relationship provided no inversion has taken place. 3. If we raise the temperature the film will expand. 4. This is the case providing that the chain molecules are shortened. 5. Should we weigh the cord, we should find its weight so small as to be negligible. 6. If the operation has been performed properly, the material will give a negative test for instauration. 7. If the masses of equal volumes are not the same, the density is not uniform. 8. It would have been risky to answer these questions by a simple "yes" or "no" if they had not been verified by experiment. 9. Were the speed of the rocket equal to that of light, its mass would be infinite. 10. Of course the waves might have been discovered if Maxwell had not predicted them from his mathematical theory of electricity and magnetism, but they were not so discovered.