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 peculiar 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. 



