318 J. LeConte on the Correlation of Forces. 
growth takes place by multiplication of cells throughout the 
whole plant—in other words, a true interstitial growth as in 
formed by the partial decomposition of highly carbonized or- 
ganic food. 
forms the base and the animal kingdom the apex. The absolute 
necessity of this arrangement on the principle of the conserva 
tion of force may be thus expressed. Matter, force and energy 
are related to one another in physical and organic science some- 
what in the same. manner as matter, velocity and momentum 1D 
mechanics. The whole energy remaining constant, the greater 
the intensity of the force (the elevation in the scale of existence) 
the less the quantity of matter. Thus necessarily results what 
I have called the pyramid of nature, upon which organic forces 
work Spiewsk nk chosimnl-and chemical forces downwards. 
