The explanation ls simple. The fain
are traveling In opposite directions, and
the motion of the uear one overcomer*
thnt of tlu- far one. Were they trav?
eling the opposite direction In the wall**
their motion would be synchronous,
and no Illusion would be apparent, or
were tbe near one traveling only hnlf
as fast as the far one the latter would
appear to revolve only half as fast as
lt really does; but. being on the same
rrlrcult and traveling at the same rela?
tive rate of speed, the explanation giv
pn ls the true ona,
Thousands of persons have wltness
?d the Illusion, yet not oue has offered
hus far an explanation, nnd so com?
pete ls the deception thnt there are
'ew whs notice lt nt nil unlcgs their at
entlon ls called to lt, when they resi?
ze thnt the Ians are both going nt like
?ates of speetl. A slow motion would
ie of no avail to draw out the vltlnted
ilr of the great room, ami n glance at
he far fan through the aperture men
loned will Instantly convince one of
he tremendous speed of both.?Phlla
lelphia Press.
A DatiRrrona Walk.
A high trestle bridge a quarter of a
ille long supports the single track ot
be Nickel Plate railway across tbe
alley of Grand river. Ohio. Recently
young man crossed this bridge under
brining circumstances. A Cleveland
xchange tells the story:
He wns half way across when a fnst
?alu rounded the curve behind him.
here was not n moment to lose, and
e quickened his pace, not an easy
isk on the ties.
