ROTATING DISKS. 



2fi3 



ECot used to this arrangement I waited till one was on 

 the disk(F^ig. 25) and then gently drew it to the other 

 side of p, as shown in Fig. 26. In this ease, however, 

 the ant did not turn round, but went on to g, when she 

 seemed a good deal surprised at finding where she was. 

 In continuation of the preceding experiments I 

 constructed a circular table 18 inches in diameter. 

 It consisted, as shown in Figs. 27 and 28, of three 

 concentric pieces-a central F g, an intermediate 

 3> E, IJ I, and an outer piece li c, K L, each of these 



M 



Fig. 27. 



_// C F 



]p^ i'o||i!Bilii|BPimiiil!iii!iiinill 





a h 



W 



three pieces being capable of separate rotation. Thia 

 arrangement was kindly devised for me by Mr. Francis 

 Gait on. 



I then connected the table with a nest of Lasias 

 uiyer by a paper bridge a, and also made a jxaper path 

 across the table, as shown in Fig. 28, divided into five 

 I)ieces corresponding to the divisions of the table. 

 This I did because I found that the ants wandered Jess 

 if they were provided with a paper road than if they 

 walked actually on the wood itself. I then j.laced a 

 cup contaiuhig larvae on the table at B, and put an unf on 



