304 EXPERIMENTS TO TEST 
slides for the microscope, viz. 3 inches by 1, and pasted 
on them slips of paper coloured respectively blue, green, 
orange, red, white,and yellow. I then put them on a lawn, 
in a row, about a foot apart, and on each put a second 
slip of glass with a drop of honey. JI also put with them 
a slip of plain glass with a similar drop of honey. I had 
previously trained a marked bee to come to the place for 
honey. My plan then was, when the bee returned and 
had sipped about for a quarter of a minute, to remove the 
honey, when she flew to another slip. This then I took 
away, when she went to a third; and soon. In this 
way—as bees generally suck for three or four minutes 
—-I induced her to visit all the drops successively before 
returning to the nest. When she had gone to the nest 
I transposed all the upper glasses with the honey, and 
also moved the coloured glasses. Thus, as the drop of 
honey was changed each time, and also the position of 
the coloured glasses, neither of these could influence 
the selection by the bee. 
Tn recording the results I marked down successively 
the order in which the bee went to the different coloured 
glasses. For instance, in the first journey from the 
nest, as recorded below, the bee lit first on the blue, 
which accordingly I marked 1; when disturbed from 
the blue, she flew about a little and then lit on the 
white ; when the white was removed, she settled on 
the green; and so on successively on the orange, yellow, 
plain, and red. I repeated the experiment a hundred 
times, using two different hives—one in Kent and 
