THE SILENT LANGUAGE OF ANIMALS 187 



me alone! stay away!" Certain low species of 

 monkeys, the lemurs, have a remarkable bare 

 patch on the forearm, which covers a gland serv- 

 ing some use. 



If we marvel at the keenness of scent among 

 animals, how incredible seems the similar sense 

 in insects similar in function, however different 

 the medium of structure may be. Think of the 

 scent from a female moth, so delicate that we 

 cannot distinguish it, attracting a male of the 

 same species from a distance of a mile or more. 

 Entomologists sometimes confine a live female 

 moth or other insect in a small wire cage and 

 hang it outdoors in the evening, and in a short 

 time reap a harvest of gay-winged suitors which 

 often come in scores, instinctively following up 

 the trail of the delicate, diffused odour. It is 

 surely true that the greatest wonders are not 

 always associated with mere bulk. 



