pie which belongs to plants as well as animals, depends on 

 Galvano-electric force, while chrystalization which belongs to the 

 mineral kingdom, and extends up through the vegetable and 

 animal kingdoms, depends on Electro-magnetic force. 



These three forces arise from one and the same cause, viz., 

 the combination of oxygeneous and hydrogeneous substances,* 

 under a sufficient degree of previous calorific motion to cause 

 their action, and differ from each other only, in being the result 

 of more complicated arrangements, as we pass upward from the 

 most simple in the mineral to thg most complicated in the animal 

 organization. 



In explaining the elements of motion, we must go back to the 

 first principles. All bodies in the solar system, as well as all the 

 atoms in the solid mass, while operated upon by caloric, move in 

 orbits consisting of three motions combined, the centrifugal, cen- 

 tripetal and tangental. 



If a fire be kindled in an open space on the surface of the 

 earth, oscilation is the immediate result ; the rarified air is pro- 

 pelled upward, passes off" and returns in a more dense state 

 below. Now if this fire was kindled up, like the sun, in a place 

 far removed from all other bodies, the repulsions and attractions, 

 that is, the oscilations, would take place in all directions from 

 and towards the central source, every body floating in space, 

 within the reach of its influence, would move from it and then 

 return, not in direct lines, but in eliptical orbits round the centre, 

 approaching towards circles in proportion to the density of the 

 body. Thus there are two extremes between which all bodies 

 move, for there can be none so dense as to move in a circle, and 

 none so rare as to move in straight lines to and from the centre. 

 Light and heat move in straight lines, therefore they are not 

 bodies nor atoms, but consist of motion communicated from par 

 tide to particle of the ethereal medium through ivhich they pass, 

 producing a succession of minute consecutive oscilations. (Here 

 we may infer, hypothetically, that heat depends on the length, 

 light on the rapidity, and chemical rays on the width, of these 



* These extremes constitute, probably, the ultimate source oi the seiual relations in 

 plants and animals. 



