Monboddo also traced the evolution of modern European languages and gave particularly great effort to understanding the ancient Greek language, in which he was proficient. He argued that Greek is the most perfect language ever established because of its complex structure and tonality, rendering it capable of expressing a wide gamut of nuances. Monboddo was the first to formulate what is now known as the single-origin hypothesis, the theory that all human origin was from a single region of the earth; he reached this conclusion by reasoning from linguistic evolution (Jones, 1789). This theory is evidence of his thinking on the topic of the evolution of Man.