M VEKTEliKATFS : MAMMALS. 



l^ird, the leg of ;i Turtle, and the fin of a Fisli, corres- 

 pond to one another in their most important features, 

 each being modified according to the use to which it is 

 put. This is quite plainly seen in Figs. 23-33, where 

 corresponding parts are marked with the same letter. 



The Vertebrates are divided into Mammals, Birds, 

 Reptiles, Batrachians, and Fishes. 



MAMMALS. 



The Mammals are Vertebrates whose skin is covered 

 \vith hair and which bring forth living young and nour- 

 ish them with milk. Man, Monkeys, Beasts of Prey, 

 Hoofed Animals, Whales, Bats, Moles, Squirrels and 

 Rats, Sloths, Kangaroos and Opossums, and Duckbills, 

 come under this head. They all breathe air by means 

 of lungs, have warm blood which is sent throughout 

 tlie body by means of a heart constructed like that of 

 Man, and the neck has onl}- seven vertebra;. 



Man. 



Man is at the head of the Animal Kingdom. He is 

 the only animal to whom the upright position is nat- 

 ural ; the only one which has a perfect hand ; the only 

 one whose forward extremities — arms and hands — are 

 not used for locomotion ; the only one that laughs : the 

 only one that speaks a language ; his brain is larger 

 than that of almost any other animal," and he can live 

 in all countries. But Man is also far more than an 

 animal. He has a mind and a soul and can learn 

 much about the things \\'hich God has made. 



"The br.iin of llie Eleplianl and of the Whale is larger tlian that of 

 Man, but the animals themselves are also far lart^cr. 



