COSMIC PHILOSOPHY 



moreover, as nearly as possible like every other 

 part, in molecular texture, in atomic composi- 

 tion, in temperature, and in specific gravity. 

 Here in two ways we may notice how homo- 

 geneity is eventually succeeded by heterogene- 

 ity. In the first place all animal germs are 

 homogeneous with respect to each other, while 

 the animals developed from them present all 

 kinds and degrees of diversity ; and, in the sec- 

 ond place, each germ is homogeneous with re- 

 gard to itself, while the creature developed from 

 it is extremely heterogeneous. The vegetable 

 world exhibits a state of things essentially the 

 same, though less conspicuous in its contrasts. 

 Starting from the homogeneous germ, we 

 may follow out a parallel series of differentia- 

 tions, resulting respectively in molecular rear- 

 rangements of chemical elements and in molec- 

 ular and molar modifications of tissues and or- 

 gans. The chemical differentiations have been 

 so well and so concisely described by Mr. Spen- 

 cer that I cannot do better than cite the passage 

 entire : " In plants the albuminous and amy- 

 laceous 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 meta- 

 morphosed into wax. In this place starch 

 passes into one of its isomeric equivalents, sugar; 

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