SENTINELS. 289 



October 9. — Called them out at 6.40. Out of the 

 Qrst ten, eight were marked ones. 



Called them out at 11.30 A.M. Out of ?ix, 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. 



5 P.M. 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 out first, no less than seventy- 

 one were marked ones, though out of the whole numher 

 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. 



