premise: In 1909 , he joined the American Museum of Natural History and became ( 1921 ) the first curator of the newly created Department of Entomology , where he remained for the rest of life . He created popular museum exhibits , including the first insect dioramas and " insect zoos " featuring live specimens . In the 1920s , established the country 's first guided nature trail in Harriman State Park , New York . Wilhelm Roux ( Died 15 Sep 1924 ; born 9 June 1850 ) . What happened after the death of Wilhelm Roux ?
hypothesis: His basic principles were maintained but his exhibitions and trails were changed