344: THE LAW OF EVOLUTION CONTINUED. 



eralogists nor meteorologists have yet enumerated, and the 

 molten globe out of which it was evolved, the contrast in 

 heterogeneity is sufficiently striking. 



§ 119. The clearest, most numerous, and most varied 

 illustrations of the advance in multiformity that accompa- 

 nies the advance in integration, are furnished by living or- 

 ganic bodies. Distinguished as we found these to be by the 

 great quantity of their contained motion, they exhibit in an 

 extreme degree the secondary re-distributions which con- 

 tained motion facilitates. The history of every plant and 

 every animal, while it is a history of increasing bulk, is also 

 a history of simultaneously-increasing differences among the 

 parts. This transformation has several aspects. 



The chemical composition which is almost uniform 

 throughout the substance of a germ, vegetal or animal, 

 gradually ceases to be uniform. The several compounds, 

 nitrogenous and non-nitrogenous, which were homogene- 

 ously mixed, segregate by degrees, become diversely pro- 

 portioned in diverse places, and produce new compounds by 

 transformation or modification. In plants the al- 



buminous and amylaceous matters which form the substance 

 of the embryo, give origin here to a preponderance of 

 chlorophyll and there to a preponderance of cellulose. Over 

 the parts that are becoming leaf-surfaces, certain of the 

 materials are metamorphosed into wax. In this place starch 

 passes into one of its isomeric equivalents, sugar; and in that 

 place into another of its isomeric equivalents, gum. By sec- 

 ondary change some of the cellulose is modified into wood; 

 whiJe some of it is modified into the allied substance which, 

 in large masses, we distinguish as cork. And the more nu- 

 merous compounds thus gradually arising, initiate further 

 unlikenesses by mingling in unlike ratios. An animal- 



ovum, the components of which are at first evenly diffused 

 among one another, chemically transforms itself in like 

 manner. Its protein, its fats, its salts, become dissimilarly 



