288 SENSE OF SMELL. 
hive ; but if one is placed on the alighting-stage, the 
others seem to take no notice of it, though it is in 
general soon pushed off accidentally by their move- 
ments. I have even seen the bees sucking the juices 
of a dead pupa. 
As regards the senses of bees, it seems clear that 
they possess a keen power of smell. 
On October 5 I put a few drops of eau de Cologne 
in the entrance of one of my hives, and immediately 
a number of bees (about fifteen) came out to see what 
was the matter. Rose-water also had the same effect ; 
and, as will be mentioned presently, in this manner 
I called the bees out several times; but after a few 
days they took hardly any notice of the scent. 
These observations were made partly with the view 
of ascertaining whether the same bees act as sentinels. 
With this object, on October 5 I called out the bees by 
placing some eau de Cologne in the entrance, and 
marked the first three bees that came out. At 5 P.M. 
I called them out again; about twenty came, including 
the three marked ones. I marked three more. 
October 6.— Called them out again. Out of the first 
twelve, five were marked ones. I marked three more. 
October 7.—Called them out at 7.30 a.M. as before. 
Out of the first nine, seven were marked ones. 
At 5.30 P.M. called them out again. Out of six, 
five were marked ones. 
October 8.—Called them out at 7.15. Six came out, 
all marked ones. 
