sentences:  In 1941 he obtained his second doctor's degree at the Sorbonne with the thesis "".During World War II German occupation of The Netherlands, by virtue of his anti-Bolshevist sympathies, he appears to have been asked to publish articles and give lectures praising National Socialist policies.His openly expressed appreciation of the bravery of Russian fighting-men, based upon his first-hand experiences during the Great War, did little to endear him to the occupying German and collaborating Netherlands authorities and he was dropped from favor, apparently narrowly missing incarceration because of these views.