90 HOURS WITH NATURE. 



BUTTERFLY. 



2. One pair of feelers. 2. Two pairs of feelers. 



3. Two pairs of wings. 3. No wings. 



4. Three pairs of limbs. 4. Five pairs of limbs. 



5. Body not enclosed in a 5. Body with all the limbs 

 shell. enclosed in a shell. 



Good. That will do for our present purpose. You 

 see they are alike in some respects, yet unlike in others. 

 In the fundamental plan of their construction, all these 

 creatures, the butterfly, mosquito, prawn, crab, spider, 

 scorpion, centipede &c., are alike, in that they all 

 possess segmented bodies provided with jointed limbs. 

 Taking advantage of this fact, Zoologists have given 

 them a common name, Arthropoda^ meaning animals 

 with jointed limbs. But then, we have also seen that, 

 although possessing these common characteristics, 

 they are unlike one another in many other respects. 

 Naturalists have again come to our help, and divided 

 them into classes, orders, families, genera, and species, 

 by grouping together such of them as have the greatest 

 resemblance to one another. Speaking of this group- 

 ing we have already learnt that the animal Kingdom is 

 'primarily divided into two main sub-divisions : animals 

 that have bones or skeleton, and animals that have no 

 bones. Among the latter we have seen many strange 

 forms which we had never seen before, and about which 

 we had but vague ideas, such as the Medusae, the 

 Zoophytes &c. Then we have seen that a large number 

 of familiar creatures belong to this sub-division. You 

 all know what a butterfly is, where prawns are found, 



