PROGRESS OF ORGANIZATION. 189 



changing. But one portion of the central vessel soon "becomes 

 enlarged, and assumes the form of a simple elongated sack. 

 This, centralizing and expressing in itself the previously diffused 

 expansive and contractile forces, performs a constant succession 

 of diastolic and systolic motions, and constitutes the rudi- 

 ment of the future heart. 



Other processions from the blood-vessels form, in like 

 manner, the rudiments of the alimentary canal, the liver, the 

 lungs, the brain, etc. These, by a constant rejection (through 

 the expansive or emanative force) of particles foreign to their 

 respective and appropriate composition, and as constant an 

 attraction and appropriation of the particles which they need, 

 finally arrive at the full maturity of their complex structures, 

 and together, form the complete living organism. The complete 

 organism, therefore, manifests the perfection of elimination of 

 unsuitable substances from each particular organ (which sub- 

 stances, therefore, go to form other organs to which they are 

 suitable), and the perfection of condensation or aggregation in 

 each organ of those substances which are suitable to its own 

 composition. 



The same remarks are, in principle, applicable to the whole 

 animated creation as to one grand Form. Its first and lowest 

 development, as shown by fossilology, consisted of polypiaria 

 and other radiated forms. Now, the polypi of a coral reef 

 may almost be considered as one extended animal, with little 

 distinction of parts. The substances and functions of heart, 

 stomach, lungs, brain, etc., seem to be iuterdifiused and con- 

 founded with each other in such a way that one portion of the 

 structure is no more vital than another, and therefore, into 

 however numerous or small fragments this animal substance 

 may become divided or subdivided, each fragment, still chaot- 

 ically embodying in itself all the principles of vitality and 



