 He also donated books to libraries, for instance in 1864 when he presented the Danish Royal Library with a copy of the New Testament, which had belonged to Kierkegaard and had his handwritten notes in it.Due to his large amount of important and rare scientific books, he was an important person in the scientific environment in Denmark, and often lent a scientist valuable works necessary for scientific studies, but too expensive for the person to buy, though sometimes the book was not handed back.He also willingly lent pictures from his large collection to exhibitions and for the use of illustrations.