80 BOAED OF AGRICULTURE. 



domestic animals, I found facts and arguments confirming the 

 theory, and aJSbrding evidence of the most convincing char- 

 acter. 



Let me explain briefly this law, with its physiological con- 

 ditions. Every animal organization is complex, — is composed 

 of many distinct organs. Each organ has a specific work to do, 

 and in its normal state, must do so much and no more. Now, 

 in the healthiest and most perfectly organized structure, all 

 these separate organs are found, not only in a perfectly 

 healthy state, each one performing its own normal functions, 

 Imt well balanced, and working harmoniously together. In 

 this case " the wear and tear," or the demands which Nature 

 makes to support life and carry on its operations, come upon 

 all the organs alike, — each according to its own nature. 



If we divide the animal structure into several divisions or 

 classes, the illustration will perhaps afford clearer and more 

 definite ideas. The most natural division would be as follows, 

 and, for the sake of convenience, we call these divisions Tem- 

 peraments : — 



1. The brain, the spine and all the nervous tissues — called 



the Nervous Temperament. 



2. The lungs and the heart — the Thoracic or Sanguine. 



3. The stomach, liver, bowels and organs in the abdomen 



— the BiUous or Lymphatic. 



4. The bones, muscles, ligaments, constituting the frame- 



work of the body — the Motive Temperament. 

 Now, if any one class of organs indicated by one of these 

 temperaments predominate, it disturbs the balance of organi- 

 zation, — and the greater this predominance, the more this 

 harmony is impaired. AYhen these organs are perfect in struct- 

 ure and healthy in action, we call their possessor a model, 

 a standard ; and upon this standard or perfect model rests 

 the great law of propagation ; here we look for its origin ; 

 here must be its seat. As you diverge from this point, the 

 variations that arise do but confirm the law, and the results 

 furnish illustrations more and more marked and significant 

 of the imperative force of this law. Here comes in that well 

 known law of inheritance, viz. : "Like begets like," — which 

 has been demonstrated in thousands of instances, though sub- 

 ject to certain conditions. 



