230 



RESEARCHES ON FUNGI 



fungus heaps some 8 feet distant. I noticed, however, that the 

 path of approach to the fungi was by no means a straight line but 

 was made up of a series of curves. At 10.45 P.M. I found the slug 



FIG. 82. Plan of ground used for making long-distance chemotactic experiments 

 with the slug, Umax maximus : a, the border where the slugs lived, con- 

 taining ferns, blocks of sand-stone b, and trees c ; d, a lawn ; e e, a smooth 

 gravel carriage-way ; / and i, grass-plots ; g, the front door step of the house h. 

 The numbers I, III, VI, and VII show the positions of the fungi in Experi- 

 ments I, III, VI, and VII, as described in the text. The dotted lines and 

 arrows show somewhat diagrammatically the routes taken by the slugs for 

 Experiments I, III, and VII. Experiments I and III were made with a fruit- 

 body of Phallus impudicus contained in a pot, Experiment VI with three species 

 of Agaricineae, and Experiment VII with two. The dimensions of the area 

 of gravel, etc., and the distance traversed by the slugs are indicated by the 

 scale. 



about 4 feet from two of the heaps of fungi, and at 11.20 P.M. 

 I found the slug actually upon one of the fruit-bodies of Boletus 

 scaber quietly feeding. No other slug could be seen anywhere. 

 The next morning I detected the slime-trail of the slug in the 

 neighbourhood of the heap of Boleti but nowhere else, the trail 

 having been weakened or destroyed by dew formation ; and the 



