Like all newborn visions, the holism vision in the 19th century was almost impossible to express directly. Intimations of it can be glimpsed in art and imaginative fiction, or in off-the-cuff remarks by otherwise conventional scientists, but it was never consciously articulated. Even when it became more visible towards the end of the century, it remained largely ineffable.
The easiest way to trace the emergence of holism is thus through its association with the slightly older chaos vision. Between about 1886 and 1926, these two visions operated in concert to challenge the faltering but still dominant partnership of reason and scientific materialism.
The association of chaos and holism was a natural rival to the existing partnership. Both combined an inner experience-based vision with a scientifically-based vision, and both were intended to reconcile mind with matter and human beings with the cosmos. However, they did so from different starting premises and arrived at very different conclusions.
The pairing of reason and scientific materialism emphasized objective knowledge based on an arms-length relationship between a rationally-constructed material world and a human mind which could stand outside that world and master its secrets.
In stark contrast, the pairing of chaos and holism focused on participatory knowledge of a cosmos that might never be fully comprehended but could be engaged with through empathy and intuition. And the shift from one model to the other defines almost everything that differentiates the early 20th century from the 19th.