24 



Class Insecta. 



lungs, so in such animals as the bees, we see the relation 

 between this intricate system of air tubes — their lungs — 

 and the quick busy life which has been proverbial of them 

 since the earliest time. The class Insecta also includes the 

 spiders, scorpions, with their caudal sting so venomous, and 



Fig. 2. 



Respiratory Apparatus of Bee, magnified— AJter Vtinean. 

 9"l^iB:pT°^chi^". A''^"™™- -^ Antenna, . Compound Eyes. / Air-sacs, «'^" 



mites, which generally have, in lieu of the tubes, lung-like 

 sacs, and the myriapods, or thousand-legged worms— those 

 dreadful creatures, whose bite, in case of the tropical centi- 

 peds, or flat species, has a well-earned reputation of being 

 poisonous and deadly. 



