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 1 834, 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, 

 in 1855, Dr. Yerhaeghe, 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 being. 



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 solar phosphori ; Bec- 

 caria, from his own experiments, came to the same 

 conclusion about the same time. In 1802, Enge- 

 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 Hitter, Goethe, and Seebeck. 



N 



