134 PHOSPHORESCENCE OF SCOLOPENDRA. 
noticed), and that this fluid can be communicated 
by the centipede to every part of its tegument. 
He has remarked also—and his observation has 
since been confirmed by Kirby and Spence—that 
this fluid can be received upon the hand, where it: 
will remain luminous for some seconds. But the 
most curious of Macartney’s observations is this— 
he believes that this pecuhar luminous substance 
of S. electrica does not shine in the dark unless 
it has been previously exposed to the solar rays. 
This is certainly a remarkable observation, and 
if it should be confirmed by future investigations, 
it will constitute a very important feature in the 
phenomena of animal phosphorescence. We shall 
see presently that a similar observation has been 
made with regard to the phosphorescent substance 
of a luminous insect belonging to the genus Lam- 
pyris. 
