INTELLIGENCE OF EARTHWORMS 



333 



until September, 191 2. It is the writer's purpose to presen 

 later a monographic account of his experiments with species 

 of Allolobophora and Lumbricus. 



Figure 1. Perspective of T apparatus for study of habit formation in the earth- 

 worm. A 1, plate-glass base for parts of apparatus; A 2, layers of white blot- 

 ting paper covering approximately two-thirds of A 1 ; w, w, w, w, plate-glass 

 walls of T-shaped passage-way; En.T., wooden entrance tube, lined with 

 moistened white blotting paper, from which worm enters passage-way, as 

 indicated by arrow (the cover of the tube is shown removed); Ex.T., wooden 

 exit tube in position for reception of worm as it emerges from open arm of 

 glass T (in this case, the cover is in position); P, strip of sandpaper resting on 

 A 2 and extending across passage-way; E, pieces of copper wire serving as 

 electrodes, insulated and kept at fixed distance from one another by the cor- 

 rugations of the strip of rubber, R; I, inductorium, wires from the secondary 

 coil of which terminate in the electrodes at E; K, key in primary circuit of 

 inductorium; B, dry cell. 



In figure i is reproduced a perspective drawing of the appa- 

 ratus used in the investigation. It consists of a T shaped 

 labyrinth of plate glass, with runways 2 centimeters wide. The 

 glass walls, w, are 2\ centimeters high and the distance from 

 either entrance to the middle point of the unbroken wall is 

 12 centimeters. The walls are held together by four pieces of 

 glass which are cemented to their upper surfaces with "cemen- 



