SENTINELS. 289 
October 9.—Called them out at 6.40. Out of the 
first ten, eight were marked ones. 
Called them out at 11.30 a.m. Out of six, three 
were marked. I marked the other three. 
Called them out at 1.30 P.M. Out of ten, six were 
marked. 
Called them out at 4.30. Out of ten, seven were 
marked. 
October 10.—Called them out at 6.5 a.m. Out of 
six, five were marked. 
Shortly afterwards I did the same again, when out 
of eleven, seven were marked ones. 
5.30 P.M. Called them out again. Out of seven, 
five were marked. 
October 11.—6.30 a.m. Called them out again. 
Out of nine, seven were marked. 
5pm. Called them out again. Out of seven, five 
were marked. 
After this day they took hardly any notice of the 
scents. 
Thus in these nine experiments, out of the ninety- 
seven bees which came ont first, no less than seventy- 
one were marked ones, though out of the whole number 
of bees in the hive there were only twelve marked for 
this purpose, and, indeed, even fewer in the earlier ex- 
periments. I ought, perhaps, to add that I generally 
fed the bees when I called them out. 
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