Termites 339 



systems of these " substitution royalties" being stimu- 

 lated to full development by judicious feeding. It is 

 believed that the nature of the food determines in all 



Fig. 178. — Fotmi o( Termltsi (Tcr»icsj7avi/es, Koll.), America, a. queen ; 6. 

 female nymph with wing rudiments; c. worker; li. soldier. Magnified 

 7 times. From Marlatt, Bull. 4 (n.s.), Div. Ent. U.S. Dept. Agr. 



cases whether a young nymph is to grow into a 

 worker, a soldier, or a sexually mature insect. Wood 

 is a favourite food of the termites, but they devour 



