Very little is known about Benno Kerry (born as Benno Kohn).¹ On 20 May 1889 he died of an ear infection at the young age of 30. Before this early death, however, he managed to launch the publication of a series of eight articles, "Über Anschauung and ihre psychische Verarbeitung".² Though he finished his studies in Strassbourg in 1885, with a habilitation thesis entitled Grundzüge einer Theorie der mathematischen and nicht-mathematischen Grenzbegriffe, he often visited relatives in Vienna, where he also attended lectures, including at least one by Brentano (Philosophy of Aristotle, WS 1877/78), with whom he also corresponded on a regular basis. In 1888 he decided to publish a book which was to encompass both the results of his habilitation thesis and further developments in his investigations. Most of the resulting work was published posthumously as the first volume of System einer Theorie der Grenzbegriffe. Ein Beitrag zur Erkenntnistheorie (1890), though material for a second volume was left unpublished.