He was the brother of the art critic and anarchist Jacques Mesnil.
His attempt to submit a psychological thesis for a Brussels doctorate was blocked by Guillaume Tiberghien (1819–1901) in what became known as the Dwelshauvers affair, and Dwelshauvers only started lecturing in philosophy after Tiberghien's retirement.
In a series of articles between 1905 and 1908 Dwelshauvers criticised Henri Bergson's reliance on qualitative intuition for the study of psychological phenomena.
[1] He also wrote for a range of literary magazines, including La Société Nouvelle and the Flemish publication Van Nu en Straks [Today and Tomorrow], edited by his brother.
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