620 PROCEEDINGS OF THE ACADEMY OP [Sept. 



Experiment S. — Time, 21 



Blue pane, transmitting orange, yellow, green, blue, indigo, 

 violet. 



Colorless pane, transmitting red, oi-ange, yellow, green, blue, 

 indigo, violet. 



The ants showed indifference concerning the two sides of the cell. 

 They at first remained four days under the colorless pane, and when 

 I then interchanged the panes, they remained ten consecutive days 

 under the blue. I then reversed the panes again, and they 

 remained under the colorless pane to the end of the test, seven 

 days. 



This indicates that the red rays transmitted by the colorless pane 

 presented no definite attraction to them. 



Experiment 9. — Time, 31 days. 



Yellow pane doubled, transmitting red, orange, yellowy green, 

 blue, indigo. 



Green pane doubled, transmitting yellow, green, blue, indigo. 



A daily interchange of the panes caused no removal of the ants. 

 The red and orange transmitted on the yellow side did not attract 

 them. 



Experiment 10. — Time, 50 days. 



Blue pane, transmitting orange, yellow, green, blue, indigo, 

 violet. 



Double indigo pane, transmitting yellow, green, blue, indigo, 

 violet. 



The ants stayed consecutive days on each side, and never 

 removed on account of an interchange of the panes. They have 

 not, therefore, a preference for the orange rays transmitted by the 

 blue pane. 



Experiment 11. — Time, 20 days. 



Treble orange, transmitting red and green. 



Double green, transmitting yellow, green, blue, indigo. 



After three dilatory removals to the orange side, the ants became 

 indifferent to their location in the cell. 



Experiment 12. — Time, 30 days. 



Treble orange, transmitting red, green. 



Single orange, transmitting red, orange, yellow, gi'een, blue. 



The ants stayed indifferently under either pane, and never moved 



