122 “PREATISE ON THE 
teresting. In about twenty-four hours they 
are aware of the misfortune that has befallen ° 
them, and without loss of time they set about 
repairing the disaster. They fix upon a 
worm not more than three days old, demo- 
lish the three contiguous cells, and raise 
around it a regular cylindrical enclosure, 
At the end of three days the workers change 
the direction of the cell, which has hitherto 
been horizontal, into a perpendicular posi- 
tion, working downwards about one inch in 
-lengthand half aninch in thickness. In addi- 
tion to this conclusive experiment, I shall take 
the liberty of detailing some of my own on 
the same subject, which were made some 
years ago, and which I have repeated almost 
every year since with the same success. I 
give experiments, not from any idea that 
those of Schirach and Huber require confir- 
mation, or that my own are of importance 
enough to supply any such supposed defi- 
ciency, but on the obvious principle that the 
more numerous the experiments, and the 
greater the diversity of experimenters, the 
