228 E. A. ANDREWS 



23. When large numbers were mingled with large numbers 

 of aliens at once, the normal fighting response was not seen. 



24. The discriminations seen, between response to fellow mem- 

 bers and to aliens, admit of interpretation on the hypothesis of 

 a nest aura, or emission of substances characteristic of all but 

 the youngest members of each community; at the same time 

 movements of air, character of motion and vibrations emitted 

 by aliens may yet be found to play important part in this dis- 

 crimination. 



25. Termites washed in water act unlike normal termites and 

 call out responses from aliens and fellows often different from 

 the normal. 



26. Often a well-washed termite is attacked both by aliens 

 and by fellows. 



27. While we may ascribe the results of washing to removal 

 or masking of a nest aura, other factors may be important. 



28. Termites may respond both to injured and to washed 

 termites by a use of both ends of the body like that in the build- 

 ing of arcades and this suggests an internal association of their 

 actions toward many things agreeing chiefly in being external 

 to or different from the nest aura. 



29. Attempts to restore to termites hypothetical substances 

 washed off led to confusing results showing the need of more 

 exact experimentation. 



30. This preliminary reconnaissance of the activities of these 

 termites favors the view that chemical environment may be 

 peculiarly potent for these creatures. 



The enormous waste inseparable from such a non-nitrogenous 

 food as wood provides the opportunity for utilization of the 

 surplus and wastes in architecture. 



Not only, according to Grassi and others, may the diverse 

 castes be developed from like embryos by differences in food 

 given them, but the whole adult community may be held to- 

 gether and marked off from what is foreign by response to sub- 

 stances which enable the termites to distinguish their own and 

 to use the wood material in emphasizing the line of demarcation. 



Nevertheless it is to be expected that examination will reveal 

 that besides the chemical environment influences of vibrations 

 and mechanical contacts are potent through the whole life of 

 the community. 



