SENSATION AND REACTION 



79 



doubt that in many cases of their occurrence this belief is 

 well-founded, because they are associated with some 



^:i 



Fig. 26. — A, Cross-section of hind shin of Red Ant (Myrmica rubra) 

 showing chordotonal organ (ch) with its scolopales (s), ganglion cells (nc) 

 and nerve-fibres («). e, epidermis ; ai, cuticle. X 120. After C. Janet 

 (" Observations sur les Fourmis," 1904). B, Scolopophore from the 

 chordotonal organ of a Longhorn Beetle Larva (Ergates). I, ligament ; 

 c, cap-cell ; s, scolopale ; v, vacuole ; e, enveloping cell ; 7ic, ganglion 

 cell ; n, nerve-fibre. X 500. After W. N. Hess (Ann. Entom. Soc. 

 Amer. x, 1917). 



