234 8IU JOHN ITJBBOCK ON BEES, WASPS, AJTD ANTS. 



I have also made some observations with the view of ascertain- 

 ing whether the same bees act as sentinels. With this object, on 

 the 5th of October, 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, m- 

 eluding the three marked ones. I marked three more. 



Oct. 6. Called them out again. Out of the first twelve five 

 were marked ones. I marked three more. 



Oct. 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. 



Oct. 8. Called them out at 7.15. Six came out, all marked 



ones. 



Oct, 9. Called them out at 6.40. Out of the first ten, eight 



were marked ones. 

 jj ,j 11.30 A.M. Out of six, three were 



marked. I marked the other three. 

 ,j „ „ 1.30 P.M. Out of ten, six were 



marked. 

 ,j „ ^, 4.30. Out of ten," seven were 



marked. 

 Oct, 10. „ „ 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, 

 Oct. 11. 6.30 A.M. Called them out again. Out of nine, seven 



were marked. 

 „ 5 P.M. „ 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 number of bees in the hive there were 

 only twelve marked for this purpose, and, indeed, even fewer in 

 the earlier experiments. I ought, however, to add that I gene- 

 rally fed the bees when I called them out. 



It is sometimes said that the bees of one hive all know one 



