Cosmic evolution is an integration of matter and concomitant dissipation of motion. According to Herbert Spencer, the evolution of the cosmic world out of chaotic matter and its motion can be adequately explained by mechanical laws.

He states that the evolutionary process is due to the operation of three mechanical laws, viz; the law of instability of homogeneous matter, the law of multiplication of effects and the law of segregation of objects.

Cosmic evolution is the result of mechanical integration or out-flows of motion. Spencer accepts the nebular hypothesis of Kant and Lap lace and asserts that the solar world once was in the form of "cloud-dust". The atoms composing the cloud-dusts, being constantly restive, produced tremendous heat and light by their friction. But as the restive character of the atoms resulted in continuous dissipation or out-flow of energy, they gradually begin to cool down and solidity. But this process of gradual cooling down and solidification of the solar system was not blind mechanical laws, but is a preparation for the reception of life on earth. Such a reception can be explained only in the light of an intelligent designer immanent in the world-process itself. The world is moving forward towards a finality that is inherent in itself.