176 



CHAPTER XV. 



CONNECTED RECAPITULATION OF THE VARIOtTS 

 TOPICS TREATED IN THE PRECEDING CHAP- 

 TERS. 



We have now gone over nearly all of the ground 

 that I have thought it advisable to traverse, in a trea- 

 tise of this character. It may be of advantage, in 

 dosing, to give a condensed view of the whole sub- 

 ject, recapitulating the main points that have been 

 illustrated and explained. 



Tkis will serve as a species of index, and will, at 

 the same time, recall sucn arguments and facts rela- 

 tive to the various divisions indicated, as may have 

 been forgotten. 



CHAPTER L 



The art of cultivating the 9oU; whai thit it, h Us 

 proper meanimg. 



Plants. Great division of them into orgaaic and 

 iMigaoic aafastaaces. Organic bodies bum away ; 

 incHvanic bodies incombustible. 



MOMB of organic bodies : carbon, hydrogaM, flitni* 

 gas, oxygen. 



Carl)on, a solid, of which charcoal, plumbago, and 

 the diamond are forms. Hard, and combustlUb. 



Hydrogen, a gas, colorless, ttftelaw, inodoioM^ tka 

 lightest body known. Intomiwihle, tnloahrt whm 

 Mixed wit^ air, extuigvidMt coittU u i to oa, and will 

 not sustain life. 



