In these instances, he could outsource partsof the work process to his personal amanuenses, his youngest children,Martha and Friedrich, who acted as scribes and copied book passagesthat he had marked.
Many writers and excerpters had amanuenses as helpers to copy out passages or to copy material over for them. Theodor Fontane would mark passages in books for his children to excerpt and copy over for him.
Compare this manual labor to that of more modern tools like Hypothes.is which allow one to digitally highlight and then excerpt almost automatically.