HISTORICAL NOTES. 177 
same time, by Slabber of Harlem. In 1775, 
Dicquemare discovered it again in the sea at 
Havre, and in 1810, M. Suriray called attention to 
its existence upon the same coast as a novelty. 
He gave it the name Noctiluca miliaris, which it 
has since retained. In 1834, Professor Ehrenberg, 
whilst studying the phosphorescence of the sea 
on the coast of Heligoland, met with the same 
little animal, and called it Mammaria scintillans, 
by which name it is designated in some of Hum- 
boldt’s works. M. de Quatrefages, of Paris, has 
written an interesting paper upon it; and lately, 
m 1855, Dr. Verhaeghe, of Ostend, published a 
small pamphlet, ‘ De la Phosphorescence de la Mer 
sur les Cotes d’Ostende,’ containing the results of 
his observations upon this curious little beg. 
The dates of other important discoveries con- 
nected with phosphorescent phenomena have been 
given in preceding chapters. 
In 1775, Wilson discovered that the most re- 
frangible rays only of the solar-spectrum acted 
upon the different kinds of selar phosphori ; Bec- 
caria, from his own experiments, came to the same 
conclusion about the same time. In 1802, Hnge- 
field re-discovered that the blue rays of the solar- 
spectrum acted more energetically than any others 
in promoting the phosphorescence of the Bologna 
stone, and his experiments were repeated and con- 
firmed by Ritter, Goethe, and Seebeck. 
N 
