404 APPLIED BIOLOGY 



generation is certain. A bee does not have to learn to build 

 honeycomb, for to do this is as natural as eating and moving. 

 It is an instinctive action. 



Sometimes insects seem to have ways of communicating 

 with each other. An ant or bee may, while wandering 

 around, find something good to eat, and soon many others 

 will follow the first one from the nest. This is probably 

 due to the odor of food conveyed to the nest by the first 

 insect. Also, ants can recognize those from another nest; 

 but this is due to peculiar odors, acquired in different nests 

 See article on " Communal Life of Ants," by Adele M. Fielde 

 in Nature-Study Review, December, 1905, Vol. I. 



Classes of Arthropoda 



Crustacea crayfish, crabs, water-fleas. 



Onycophora Peripatus, a rare worm-like arthropod found in 

 tropical countries. 



Myriopoda centipedes, millipedes. 

 Arachnida spiders, scorpions, mites, ticks. 

 Insecta insects. 



