506 



EXPERIMENTS SHOWING 



The precautions taken seem to me to have placed 

 the colom"8 on an equal footing ; while the number of 

 experiments appears sufficient to give a fair average. 

 It will be observed also that the different series agree 

 well among themselves. The difiference between the 

 numbers is certainly striking. Adding together 1, 2, 

 3, 4, 5, 6, and 7, we get 28 as the total number given 

 by each journey; 100 journeys therefore give, as the 

 table shows, a total of 2,800, which divided by 7 would 

 of course, if no preference were shown, give 400 for 

 each colour. The numbers given, however, are — for 

 the blue only 275, for the white 349, yellow 405, red 

 413, green 427, orange 440, and plain glass as many as 

 491 



Another mode of testing the result is to take the 

 per-centage in which the bees went respectively to each 

 colour first, second, third, and so on. It will be 

 observed, for instance, that out of a hundred rounds 

 the bees took blue as one of the first three in 74 cases, 



