SUMMARY AND CONCLUSION. 559 



manner. We have repeatedly observed that while any 

 whole is evolving, there is always going on an evolution of 

 the parts into which it divides itself; but we have not 

 observed that this equally holds of the totality of things, as 

 made up of parts within parts from the greatest down to 

 the smallest. We know that while a physically-cohering 

 aggregate like the human body is getting larger and taking 

 on its general shape, each of its organs is doing the same; 

 that while each organ is growing and becoming unlike 

 others, there is going on a differentiation and integration 

 of its component tissues and vessels; and that even the 

 components of these components are severally increasing 

 and passing into more definitely heterogeneous structures. 

 But we have not duly remarked that, setting out with the 

 human body as a minute part, and ascending from it to 

 greater parts, this simultaneity of transformation is equally 

 manifest that while each individual is developing, the so- 

 ciety of which he is an insignificant unit is developing too ; 

 that while the aggregate mass forming a society is becom- 

 ing more definitely heterogeneous, so likewise is that total 

 aggregate, the Earth, of which the society is an inapprecia- 

 ble portion; that while the Earth, which in bulk is not a 

 millionth of the Solar System, progresses towards its concen- 

 trated and complex structure, the Solar System similarly 

 progresses; and that even its transformations are but those 

 of a scarcely appreciable portion of our Sidereal System, 

 which has at the same time been going through parallel 

 changes. 



So understood, Evolution becomes not one in principle 

 only, but one in fact. There are not many metamorphoses 

 similarly carried on; but there is a single metamorphosis 

 universally progressing, wherever the reverse metamorpho- 

 sis has not set in. In any locality, great or small, through- 

 out space, where the occupying matter acquires an apprecia- 

 ble individuality, or distinguish ableness from other matter, 

 there Evolution goes on ; or rather, the acquirement of this 



