Röntgen has familiarized us with an order of vibrations of extreme minuteness compared with the smallest waves with which we have hitherto been acquainted, and of dimensions comparable with the distances between the centers of the atoms of which the material universe is built up; and there is no reason to suppose that we have here reached the limit of frequency.
To expect ... the same service from raw and undisciplined recruits, as from veteran soldiers, is to expect what never did and perhaps never will happen. Men, who are familiarized to danger, meet it without shrinking; whereas troops unused to service often apprehend danger where no danger is.george washington
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