128 PHOSPHORESCENCE OF 
white heat. When one of these worms was trodden 
upon and crushed, the phosphorescence spread 
out upon the ground, producing a long train of 
light, as if the earth in this place had been streaked 
with a piece of phosphorus. 
Hach of these Luwmbrics was remarked by their 
observers to have a well-developed clitellum, which 
proves that the worms under inspection were adults 
and that it was their period for coupling. M. 
Moquin-Tandon preserved some of these worms 
for many days, and observed that their luminous 
property resided in the sexual swelling or elitellum, 
and that their phosphorescence ceased immediately 
after copulation. 
The editor of a French periodical,* in which my 
brochure on Phosphorescence was reprinted with- 
out my consent soon after it appeared in France, 
received shortly afterwards a letter, dated 18th 
November, 1858, and signed M. Adrien, of Pont 
Saint-Esprit, im which the writer declares that, 
having read my papers, the paragraphs which 
treat of the phosphorescence of Lumbrics had re-’ 
minded him of an observation he had made about 
three years ago. 
“ One summer’s night after a rainy day,”’ says 
the writer, “I saw the ground sparkling with a 
whitish phosphoric light whilst sprmkled with 
warm urine, and I recognized at the same time 
* ¢T/ Ami des Sciences.’ Paris, 1858. 
