Human Physiology. 



saddle; rather it is a saddle. His mouth has a space for a bit. 

 He carries his rider with pride, or draws carriage, dray, or 

 plough, as if it was the one thing he came into the world to do. 

 How patient, and helpful, and intelligent ! In the chase, the 

 race, the battle, the horse is the sympathetic friend and ally of 

 man; a creature made for him and curiously adapted to him. 

 And when horses are well treated, they are very considerate 

 and affectionate; loving each other, their human care-takers, 

 and even other domestic animals. As far back as we know 

 man, the horse was his companion and servant. 



The dog is possibly a still older friend of man than the horse; 

 and his origin is a greater mystery. We see in dogs how far 

 nature can go in the production of variety in the same species, 

 and also the stern limits to that variation. Dogs through all 

 the ages ; but only dogs. All varieties breed with each other, 

 but not with any other species; nor have they ever produced 

 one. The horses and dogs of to-day are the same animals we 

 see pictured in the remains of Nineveh and Egypt. The dog 

 was made for man, and has adapted himself to man, becoming 

 strong and fierce in the bull-dog and mastiff, slender and fleet 

 in the greyhound, web-footed in the Newfoundland, hardy and 

 wonderfully sagacious in the shepherd's dog, and running into 

 curious eccentricities of delicacy in petted varieties. All this 

 has been done by human care and intelligence presiding over 

 their breeding and training; the same as in the varieties of 

 horses, from the elephantine London dray horse to the winner 

 of the Derby or the child's pony. Our own species, so distinct 

 from every other, shows a still wider variety. Turn out dogs 

 and horses wild to shift for themselves, and they would proba- 

 bly all come in a few generations to the same types. 



The camel is another animal made for man, with special 

 adaptations to a peculiar climate and conditions. Without 

 him the great deserts of Asia and Africa would be impassable 

 and uninhabitable. His feet seem expressly formed to carry 



