It was left, however, for Professor Roentgen to discover that
during the discharge another kind of rays are set free, which differ
greatly from those described by Lenard as cathode rays The most marked
difference between the two is the fact that Roentgen rays are not
deflected by a magnet, indicating a very essential difference, while
their range and penetrative power are incomparably greater. In fact,
all those qualities which have lent a sensational character to the
discovery of Roentgen's rays were mainly absent from these of Lenard,
to the end that, although Roentgen has not been working in an entirely
new field, he has by common accord been freely granted all the honors
of a great discovery.
[Illustration: SKELETON OF A FROG, PHOTOGRAPHED
THROUGH THE FLESH. THE SHADINGS INDICATE, IN ADDITION TO THE BONES,
ALSO THE LUNGS AND THE CEREBRAL LOBES.
From a photograph by Professors Imbert and Bertin-Sans; reproduced
by the courtesy of the "Presse Medicale," Paris. In taking this
photograph the experiment was tried of using a diaphragm interposed
between the Crookes tube and the plate; and the superior clearness
obtained is thought to result from this.]
[Illustration: RAZOR-BLADE PHOTOGRAPHED THROUGH A LEATHER CASE AND THE
RAZOR-HANDLE.
From a photograph taken by Dr.
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