FARM DEVELOPMENT 



which to gather and store up the force of the sun's rays 

 and transmit them to his uses whenever wanted. As the 

 electrician seeks the most economical form of dynamo to 

 receive the force transmitted from the steam engine, so 

 the farmer seeks the best horse, milch cow, or other 



animal that shall in the 

 most economical manner 

 receive the force from the 

 plants and transmit it to 

 whatever use may be de- 

 sired. Some chemical com- 

 pounds, within the plant or 

 animal, form storage bat- 

 Figure 5. The net returns from Ethel, fprip; of rrmrfl fr r P a t P r 

 when used in the dairy, a cow bred mainly LC1 1Cb 



aik^xr^JsrtaJE 1 *' ss p wers than thers - T^S, 



fats have nearly two 



and one-half times as much latent heat, or power, stored 

 up in a given weight as have starches and sugars, or the 

 substance of cell walls of plants, called cellulose. Vari- 

 ous compounds called proteins are also rated high in 

 value, because in addition to supplying energy they 

 nourish the muscles, nerves, bones, etc. Plants which 

 are bred so as to have a large percentage of protein and 

 fat compounds have a spe- 

 cial value, because they con- 

 tain much more available 

 latent energy than do those 

 not so bred. In like man- 

 ner, animals that are so well 

 bred that their carcasses of 

 beef, mutton or pork have a 

 larger percentage of the 

 high-priced lean meat are 

 especially valuable because 

 of the larger amounts of these more useful forms of 

 " storage batteries." The dairy cow which transforms 



Figure 6. The net returns 'from Houston, 

 a specially bred dairy cow, for one year, 

 figuring butter, skim milk and feed at 

 market prices in 1895, was $58.33. 

 Haecker. 



