124 
The Evolution of the Spheres , 
[March, 
forcing outward of the reverse motions, the superiority of 
attraction over repulsion thus constantly augmenting. Thus 
great waves of matter would begin to move through space, 
their rapidity of motion increasing as this process continued, 
every addition to the excess of parallel motions being an 
addition to the vigour of mass motions. 
Such accordance of motion could only arise through a 
loss of the reverse motions. A particle so related to sur- 
rounding forces that it is obliged to move with equal vigour 
successively in two opposite directions, can gain an excess 
of motion in one direction only by a loss in the opposing 
force in that direction, or increased vigour of the opposite 
force. It must receive this new energy from some impacting 
substance, or it must in some manner lose a portion of its 
reverse movement. 
This loss cannot well arise through impaCt. The particles 
of a sphere strike vigorously in every direction. But their 
greatest vigour of impaCt is in the direction of movement of 
the mass. Therefore loss through impaCt would tend to 
bring the mass to rest. But the resistance to impaCt of 
ethereal matter is so slight that its effeCt is inappreciable. 
Another mode of loss is through radiation. This is an 
efficient method of loss of the internal energies of spheres, 
the matter of space freely receiving radiated motion. Yet 
radiation takes place equally from the whole surface of the 
mass, and therefore has no effeCt on its mass motion. 
But in every mass, if accordant motions attract and dis- 
cordant motions repel each other, every movement in 
harmony with the general direction must be drawn towards 
the centre, its line of movement gaining a centrifugal curve. 
Every motion opposite to the general direction must be 
repelled from the centre, its line of movement gaining a 
centrifugal curve.* Thus in every mass that possesses an 
excess of motion in one direction, and therefore an excess 
of attraction over repulsion, all accordant motions must 
converge towards, all discordant motions diverge from, the 
centre. This sorting-out process incessantly continues, the 
reverse movements slowly travelling outwards, the parallel 
motions travelling inwards. Condensation of the mass is a 
necessary consequence, and also its movement as a whole, 
* One consequence of this is that the impadl energy of accordant motions 
must have a slight excess in the direction of the centre, that of discordant 
motions must be in excess outwardly. Every stroke of an attracted particle is 
partly dire&ed inwards by gravitation ; every stroke of a repelled particle is 
partly directed outwards. However slight this may be, it is a continuous 
effedt, and must give the accordant energies a constant centripetal advantage 
over the discordant. 
