He wanted Weierstrass as a colleague at Berlin, yet he realised that Weierstrass was a strong candidate for the chair he was leaving vacant in Breslau. Hence he recommended to Breslau that they appoint his former student Joachimsthal .
Siya pinaghahanap Weierstrass bilang isang kasamahan sa Berlin, siya pa realised na Weierstrass ay isang malakas na kandidato para sa chair siya ay umaalis vacant sa Breslau. Samakatuwid siya inirerekomenda sa Breslau na sila humirang ng kanyang dating estudyante Joachimsthal.