380 AGRICULTURE ON THE PACIFIC SLOPE 



hams, we must use more protein in their food (see 

 page 348). 



And so the different feeds must be mixed so as to 

 make what is called a " balanced ration" for each par- 

 ticular purpose. To do this rightly we must know 

 something of what food substances are contained in 

 the various crops and feeds (see page 354). 



Horses. The horse as we see it to-day came from 

 the Old World. The so-called wild horses of the Plains 

 are simply descendants of horses that have escaped 

 from stock ranches. Native American horses did 

 however exist in former times; for we find the bones 

 of several kinds of horses in rocks of western America 

 (figure 188). 



The extreme type of draft horses is represented by 

 the heavy, thickset Percheron, Clydesdale, and Shire, 

 much used by the draymen of cities.- They are slow 

 but steady in movement and can draw enormous loads. 



The opposite extreme is the slender, graceful race- 

 horse, light of body and with light, slender limbs. He 

 is built for speed and quick motion, but is not fit for 

 heavy draft. A somewhat similar type is the Ameri- 

 can trotter. Figure 189 shows these two types and 

 one other. 



Between the extremes we have numerous types of horses. 

 Among them is the carriage horse, of which there are several 

 special breeds, such as the English hackney and German 

 coach horse and several others. Carriage horses are ex- 



