Spontaneous Generation

Spontaneous Generation, is in regards to the origin of life moving ahead., this was known as the vitalist doctrine. Adherents of this ideal maintained that life processes where not determined solely by the laws of the physical universe, but also partly by some vital force, or vital principle.

Definitions of vitalist doctrine from the World English Dictionary: the doctrine that phenomena are only partly controlled by mechanical forces, and are in some measure self-determined., and/or.. in Biology:  a doctrine that ascribes the functions of a living organism to a vital principle distinct from chemical and physical forces.

Here's another: the philosophical doctrine that the phenomena of life cannot be explained in purely mechanical terms because there is something immaterial which distinguishes living from inanimate matter. Vital force: the force that animates and perpetuates living beings and organisms. And (esp in early biological theory) a hypothetical force, independent of physical and chemical forces, regarded as being the causative factor of the evolution and development of living organisms.

Although (by the late 1870s), most scientists agreed that all organisms arose from the reproduction of "preexisting organisms", and the concept of Spontaneous Generation had become history.