Who said "Mutation is the only source of novelty in evolution"?

This quote is attributed to Hugo de Vries.

Mutation is the only source of novelty in evolution - Hugo de Vries

"Mutation is the only source of novelty in evolution"

Hugo de Vries Science

Botanist and Geneticist Dutch 1848–1935

"Nature does not proceed by leaps"

"The origin of species lies in the nature of variation"

"Evolution is a process of continuous change"

"Life is the manifestation of divine will through matter"

"Science helps us understand the world."

"I've witnessed the birth of science, and it continues to amaze me."

"I'm something of a scientist myself."

"The fusion process is self-sustaining now!"