48 



FIRST LESSONS IN ZOOLOGY 



Fill. 28. — IjictisU (111 

 wild oats. (Nat- 

 ural size; from life.) 



in special ways. That is, 

 the structure of a part and 

 its function or business are 

 closely related. A grass- 

 hopper's hind legs are spe- 

 cially long and strong so as 

 to enable the grasshopper to 

 hop ; or we may put it differ- 

 ently and say that the grass- 

 hopper can hop because its 

 hind legs are specially long 

 and strong. In whichever 

 way we look at this relation between 

 the power of an animal to do some- 

 thing in a special way and its posses- 

 sion of parts speciall)' fitted for doing 

 this something, whether it be hopping, 

 or flying, or singing, or breathing 

 under water, it must be kept always 

 plainly in mind that such a close re- 

 lation does exist. Therefore when we 

 study the make-up of an animal, ex- 

 amining carefully the various parts of 

 the body, we should always remember 

 that this particular make-up or structure 

 is closel)' connected with the things the 

 animal can do, and the special manner 

 in which it does them. 



The grasshopper. — Grasshoppers, 

 better called locusts, of some kind can 

 be readily found along roadsides or in 

 fields (fig, 28). Collect several speci- 

 mens, keeping some alive and dropping 

 the others into the killing-bottle (see 

 p. 355V Kxaminc carefully a dead speci- 



