OBJECTS APPARENTLY SEEN THROUGH A 

 HOLE IN THE HAND 



HE following curious experiment always excites 

 surprise, and as I have met with very few persons 

 who have ever heard of it, I republish it from 

 "The Young Scientist," for November, 1880. 

 It throws a good deal of light upon the facts connected 

 with vision. 



Procure a paste-board tube about seven or eight inches 



Fig. 33- 



long and an inch or so in diameter, or roll up a strip of any 

 kind of stiff paper so as to form a tube. Holding this tube 



156 



