1885. ] Recent Literature, 1189 
vast majority of cases it was found that excision of the margin 
impairs or destroys the spontaneity of the animal for a time, the 
paralysis so produced was very seldom permanent, After a vari- 
able period occasional contractions are usually given, and in some 
cases they were resumed with but little apparent detriment. 
Light was found a most marked and unfailing stimulus, and 
light ger se, rather than a sudden transition from darkness to 
light. Hence it was satisfactorily proved that the “eyes” of 
these animals are really such, as the following experiment with 
others, proves: 
“ Having put two or three hundred Sarsiz into a large bell jar, 
I completely shut out the daylight from the room in which the 
SAN 
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ae) 
Aves RAMAN 
Aisne” 
Fic. 1.—Aurelia aurita. 
jar was placed. By means of a dark lantern and a concentrating 
lens, I then cast a beam of light through the water in which the 
Sarsiz were swimming. The effect upon the latter was most 
decided. From all parts of the bell-jar they crowded into the 
path of the beam, and were most numerous at that side of the 
jar which was nearest to the light. Indeed, close against the glass 
they formed an almost solid mass, which followed the light 
wherever it was moved. The individuals composing this mass 
dashed themselves against the glass nearest the light with a vigor 
and determination closely resembling the behavior of moths 
