CHAPTER VI. 
PROBLEMATICAL CASES OF PHOSPHORESCENCE 
IN SUPERIOR ANIMALS, AND PHOSPHORIC PHE- 
NOMENA OBSERVED IN MAN, 
In the animal kingdom phosphorescence appears 
to cease with the class of insects; % reality, how- 
ever, phosphoric phenomena have been observed 
in animals of superior organization during their 
lifetime. 
To speak, in the first place, of some proble- 
matical cases of phosphorescence in animals more 
highly organized than insects, I will state that, 
according to Carus, we are wrong in attributing 
to a simple effect of reflected ght that peculiar 
scintillation which is observed in the eyes of dogs, 
cats, tigers, etc. Rennger, in his ‘ Natural His- 
tory of the Mammalia of Paraguay’ (‘ Naturge- 
schichte der Saugthiere von Paraguay’), published 
at Basle in 1830, says, that he has seen the eyes of 
a monkey so brilliant in complete darkness, that 
they illuminated objects at a distance of half a 
foot. The animal in question is the Nyctipithecus 
