色彩論
In 1797 the most famous Orleans collection of pictures was acquired by Harman from Walter Boyd, of whom he had previously conducted extensive business with. The collection was sold in the following year to the 3rd Duke of Bridgwater. Much of the collection still remains within the Duke's family. Harman was well distinguished for his love and knowledge of the best works of the ancient masters; he was also a kind friend to many modern artists. So much so in fact that the renowned painter and collector Charles Lock Eastlake dedicated the translation of Goethe's Theory of Colours to Jeremiah. A work that was so well-loved that it ended up landing Eastlake the titles of secretary of the Fine Arts Commission and Keeper of the National Gallery of London. Being a friend and supporter of Eastlake; Harman commissioned Eastlake's first painting, a trend that would continue for many years.