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 
Fic. 2. 
Respiratory Apparatus of Bee, magnified—Ajier Duncan, 
a YRead, 6 Thorax, ¢ Abdomen, d Antenna, e Compound Eyes, / Air-sacs, g 2" 
o” Legs, f’ Trachee. 
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. 
