No. 2.] 



MENTAL POWERS OF SPIDERS. 



4CS 



again moved to the red. We proceeded in this way, driving it 

 into the various compartments, and crediting it, each time, with 

 the color it had settled in, until its account stood as follows : 

 Red i6, yellow 5, blue 2, green 2. 



The order of the colors was then changed as follows : — 



Figure 2. 



Blue. 



Yellow. 



Red. 



Green. 



After every three or four experiments the cage was brushed 

 out to remove any web-lines that the spider might have 

 formed.^ 



We now allowed the spider more time in which to choose its 

 color, and had better results. The record for July 21 and 22 

 stood as follows: Red 21, yellow 4, blue i, green 2. 



On July 18 we had placed another species of Lycosa (unfor- 

 tunately this spider and a second specimen of the same species 

 escaped before we identified them) in the second cage. After 

 it had become accustomed to its new conditions we kept a record 

 of its performances as before, with the following result : Red 

 16, yellow 2, blue 2, green o. This spider escaped on July 21. 

 The second specimen did not seem to have as marked color sen- 

 sibilities as the first, but the record of this one, also, shows a 

 preference for the red: Red 16, yellow 6, blue 3, green 2. 



On July 31a second specimen of L. nigroventris S was 

 placed in the cage, and, though very restless, soon settled down 

 in the red. The cage was carried into the direct sunlight, and 

 the spider driven into the blue, at the end ; but after a moment 

 it turned around and went back to the red. After ten minutes 

 it was driven to the opposite end into the green compartment. 

 Again it came back to the red. The record for the day was : 

 Red 10, yellow o, blue o, green 1. The cage was overturned 

 that evening, and the spider escaped. 



' AH the species used in the color experiments make no web, but stalk their prey. 



