2 20 C. H. TURNER. 



shade of window number four. Thence it flew upwards almost 

 to the ceiHng and then leftward to the nest. 



Experiment 3. 



TJie loivcr shade of zvindoiv number one xvas raised half way 

 and the upper shade as far as possible. All of the shades of zuin- 

 dows number tzvo to six were lowered except the top shade of ivin- 

 dozv number three, zvhich zvas raised as far as possible. This re- 

 produced the conditions under zvJnch the zvasp liad zvorked originally . 



On entering the room the wasp flew obliquely upwards to the 

 upper third of upright B. Then it flew vertically upwards al- 

 most to the ceiling. Thence it flew leftward to the nest. The 

 line of flight from the entrance to upright B was perceptibly 

 curved, the convexity extending towards the east. The total 

 flight from the entrance to the nest consumed about half a min- 

 ute. The shades were maintained in the above position until the 

 mud-dauber had made three trips. Each was made in practi- 

 cally the same manner. 



Experiment 4. 



The same conditions as in experiment one. 



The behavior was practically the same as in experiment one. 

 In this experiment, however, the shades were maintained in the 

 same position until the wasp had found the nest, which required 

 nearly five minutes. 



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

 second trip resembled that on the first ; but it required only three 

 minutes to pass from the entrance to the nest. 



Experiment 5. 

 The same conditions as in experiment three. 

 The wasp behaved the same as in experiment three. 



Experiment 6. 



The loiver shade of zuindow number one zvas raised half zuay and 

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

 two to six were lozvered, except the top shade of window number 

 two, which was raised as far as possible. 



The wasp on entering the room described a small circle then 



