THE HOMING OF THE MUD-DAUBER. 221 



flew obliquely upwards to a point almost to the ceiling, but a 

 little to the west of upright A. It then flew alternately leftward 

 and rightward until the nest was found, which consumed about 

 one minute. 



The wasp was allowed to make two trips. Its behavior on the 

 second trip was similiar to that on the first, and about the same 

 amount of time was consumed in passing from the entrance to 

 the nest. 



Experiment 7. 



T/ie conditions were tlic same as in experiments three and five. 

 The wasp was permitted to make two trips. It behaved the 

 same as it did in experiments three and five. 



Experiment 8. 



The lower shade of window Jiinnber one zvas raised half way 

 and the top shade as high as possible. All the shades of windozvs 

 tzvo to fonr were lowered. 



On entering the room the wasp described several small circles. 

 It then flew first to about the middle of the upper sash of win- 

 dow number three, then to window number two, then to window 

 number five. Finally, after much searching, the nest was found. 



The shades were retained in the above condition until the wasp 

 had made two trips. On the second trip it went first to upright 

 C and then, after a short search, it found the nest. 



Experiment 9. 



TJie same conditions as in experiments three, five and seven. 

 The behavior was the same as in experiments three, five and 

 seven. Two trips were made. 



Experiment 10. 



At first the conditions zvere the same as in experiment eight. 

 While the zvasp ivas on the nest, the top shade of zvindozv nnmber one 

 was lowered. 



On leaving the nest the wasp flew away through the window 

 in its usual way. The lowering of the top shade of window A 

 did not change its behavior. 



