EXPERIMENTS IN STIMULATION, 4] 
instance, however, happens to have been correct, as 
he results of the following experiments will show. 
Having put two or three hundred Sarsiz into a 
large bell-jar, I completely shut out the daylight 
from the room in which the 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 hight wherever it was moved. 
The individuals composing this mass dashed them- 
selves against the glass nearest the light with a 
vigour and determination closely resembling the 
behaviour of moths under similar circumstances. 
There can thus be no doubt about Sarsia possessing 
a visual sense. 
Anschauungen ohne Weiteres auch auf die wirbellosen Thiere der 
verschiedenen Kirese zu tibertragen und bei diesen analoga 
Sinnesempfindungen anzunehmen als wir sebst besitzen. . . 
Noch weniger freilich als die von den meisten Autoren angenom- 
mene Deutung der Randblaschen unserer Medusen als Gehérorgane 
kann die von Agassiz und Fritz Miller vertretene Ansicht befrie- 
digen, dass dieselben Angen seien. ... Alle diese Verhaltnisse 
sind mit der Deutung der Concretion als ‘Linse’ und des sie 
umschliessenden Sinnesganglion als ‘Sehnerv’ durchaus unve. 
reinbar.” 
It may not be unnecessary to say that, although the simple 
experiment above described effectually proves that the marginal 
bodies have a visual function to subserve, we are not for this 
reason justified in concluding that these are so far specialized as 
organs of sight as to be precluded from ministering to any other 
sense. 
