Dr. Degen traveled in different parts of Europe, the Balkans and Asia Minor, and was the first botanist to make an in-depth study of the Velebit flora, recording about 2.200 types of wild plants.
Dr. Degen putovao je u razne dijelove Europe i Male Azije, kako bi proučavao floru te bio prvi botaničar koji je napravio detaljnu studiju flore Velebita, snimio je oko 2,200 vrsta divljih biljaka.