Experiments on the Color Sense. 
257 
out. She ran about the box for some time, going close to the 
pink and to the blue paper without seeming to notice them. 
At last she went onto the pink paper and made two faint at 
tempts to get under the cotton. Then she found her own nest 
again and worked for a long time trying to get into it from 
the top and through the front surface, the large opening which 
she had been in the habit of using being at the bottom. She 
not only tried to work her legs in, but seemed to be tearing at 
it with her falces. Then she hung by the posterior end of her 
body and tried to work her head in. Failing to make an open¬ 
ing, she finally entered by the door at the lower end, but only 
stayed a minute. She wandered out and passing the plain 
bunch of cotton seemed to look at it, but did not touch it. 
After an hour she went back to her own nest, but passing over 
the entrance, burrowed and tore at the other parts. She 
seemed to have lost her wits. She finally entered at the 
proper place. 
July 25. We found morsitans wandering about, and guided 
her toward the pink paper, which had originally surrounded the 
true nest. She seemed attracted and went to it, and spent fif¬ 
teen minutes in investigating the cotton by means of her front 
legs, but did not try to get under it. She then walked slowly 
away. On coming within three inches of the blue paper she 
seemed to notice it, walked to it and put her head into the 
door of her nest, but then withdrew it. 
She was left for several days in the box, but manifested no 
further interest either in the cotton or in her own nest. 
Phidippus morsitans. 2. This spider laid her eggs on July 
23. We at once pasted pink paper around the nest. 
July 24. She was orced out of the nest by pressing a pencil 
on to it from above. She stayed out for two hours and was 
then guided back to the entrance. 
July 25. When pressed out of the nest she seemed much 
terrified. She is more nervous than vittata, but at the 
same time is more inclined to fight, instead of running away. 
When she does turn tail she rushes off blindly. She stayed out 
so long that we finally guided her back to her nest, and even 
17 
