142 PHOSPHORIC INSECTS. 
candle, the light reappears, and, strange to say, 1s 
not extinguished in thirty-six hours.” He adds 
to this, ‘‘ It is in vain that I endeavoured to make 
it appear again by the same process ; this singular 
phenomenon seems only to take place once.” 
This observation seems to be a complete repre- 
sentation of phosphorescence after insolation, such 
as we observe in mineral substances. It would 
certainly be interesting to ascertain whether solar 
heht has any influence upon the phosphorescence 
of glowworms. We must not forget, however, 
that the luminous substance of the glowworm is 
capable of shining for some time after death. If 
M. Roberts was not aware of this, his observation 
cannot have much weight. 
I must register here an interesting experiment 
made some years ago by Dr. Lallemand :—One 
fine summer evening, M. Bérard, of Montpellier, 
had invited to his house a number of professors 
and naturalists. Dr. Lallemand, who was present, 
caused them to witness a very curious phenome- 
non. He placed upon his hand a female glow- 
worm (Lamypris noctiluca), and stretched his arm 
out of the drawing-room window, which opened 
into the garden. Very few instants elapsed be- 
fore a male Lampyris flew into the doctor’s hand 
and immediately coupled with the vermiform fe- 
male which he held. But as soon as the act was 
accomplished, the light of the female was extin- 
guished completely. 
