Various physicists have endeavoured to measure the speed of
propagation, but it seems more and more probable that it is very
nearly that of light.[27]
[Footnote 27: See especially the experiments of Professor E. Marx
(Vienna), _Annalen der Physik_, vol. xx. (No. 9 of 1906), pp. 677 _et
seq._, which seem conclusive on this point.--ED.]
I must here leave out the description of a crowd of other experiments.
Some very interesting researches by M. Brunhes, M. Broca, M.
Colardeau, M. Villard, in France, and by many others abroad, have
permitted the elucidation of several interesting problems relative to
the duration of the emission or to the best disposition to be adopted
for the production of the rays. The only point which will detain us is
the important question as to the nature of the X rays themselves; the
properties which have just been brought to mind are those which appear
essential and which every theory must reckon with.
The most natural hypothesis would be to consider the rays as
ultra-violet radiations of very short wave-length, or radiations which
are in a manner ultra-ultra-violet.
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