254 FORM OP MEN AND ANIMALS. 



Man alone has the front teeth in the lower jaw 

 standing in an upright direction; in all other crea- 

 tures they slope backwards, hence we are the only 

 animal which has a proper chin. 



Quadrupeds whose heads are heavy and hang 

 down, are provided with a very curious and strong 

 ligament, popularly called pack-wax, at the back 

 of the neck, to hold the head up. We have 

 nothing of the sort, as our head is placed on the 

 top of the spine, and needs no such support. 



If we watch a horse or a cow on a warm day, 

 when the flies are troublesome, we shall see that 

 they have the power of wrinkling and contracting 

 the skin, so as to dislodge any thing which settles 

 upon it. This is owing to a thin muscular layer 

 stretched beneath the skin, and called the panni- 

 culus carnosus. We have nothing of the sort, as 

 our hands can reach all parts of our bodies, and 

 consequently we do not want it. 



Questions. 



Do our teeth differ from those of grazing animals 1 

 What animals have longer intestines than man 1 

 What kind of teeth and stomachs have carnivorous animals ! 

 Why is man omnivorous ? 

 How is the head of quadrupeds sustained 1 

 By what means do animals free their skins from insects or 

 4>ther foreign bodies 1 



