274 THE EEA.SON WHY. 



1 For every beast of the forest is mine, and the cattle upon a thousand hills." 

 PSALM L. 



are applied as, for example, to mix up with the earth to form the cells ; to line 

 these cells as with fine cotton ; to make light and floating threads by which they 

 may be conveyed through the air, as well as those meshes which are so 

 geometrically and correctly formed to entrap their prey. Not* by Lord 

 Brougham to Paley's Natural Tlu-rtogy. 



1083. Why have many insects a great number of eyes ? 

 Because the orb of the eye is fixed ; there is therefore placed over 



the eye a multiple-lens, which conducts light to the eye from every 

 direction; so that the insect can see with a fixed eye as readily as 

 it could have done with a moveable one. As many as fourteen 

 hundred eyes, or inlets of light, have been counted in the head of a 

 drone-bee. The spider has eight eyes, mounted upon different parts 

 of the head ; two in front, two in the top of the head, and two on 

 each side. 



1084. Why have birds of prey no gizzards ? 



Because their food does not require to be ground prior to 

 digestion, as does the food of grain-eating birds. 



1085. Why have earth worms no feet ? 



Because the undulatory motion of their muscles serves them for 

 all the purposes of progression needed by their mode of life. 



1086. Why have mussels strong tendinous threads 

 proceeding from their shells ? 



Because as they live in places that are beaten by the surf of the 

 sea, they moor their shells by those threads to rocks and timbers. 



1087. Why have cockles stiff muscular tongues ? 

 Because, having no threads to moor themselves, as the mussels 



have, they dig out with their tongues a shelter for themselves in 

 the sand. 



10S8. Why do oxen, sheep, deer, fyc., ruminate ? 



Becauss they have no front teeth in the upper jaw, the place of 

 which is occupied by a hardened gum. The first process, therefore, 

 consists simply of cropping their food, which is passed into the 

 paunch, to be brought up again and ground by J .he back teeth 

 when the cropping process is over. 



Because, in a wild state, they are constantly exposed to th 



