He concluded his doctoral thesis in Göttingen, with the title Ueber das Wesen der Prognathie und ihr Verlhaeltniss zur Schaedelbasis (On the essence of prognathism and its effect on the base of the skull).

[1] In 1883, Ihering was nominated travelling naturalist of the National Museum of Rio de Janeiro and lived in several cities by the Lagoa dos Patos.

[1] During a trip to Europe to visit some colleagues in 1907, Ihering met again his first love, Meta Buff, from Gießen, and married her that same year.

Later, during World War I, he was accused of nepotism and of selling to the state a stone that was donated to the Museu Paulista.

[1] He returned to southern Brazil and continued his studies in Santa Catarina, and in 1918 he was invited to occupy the chair of zoology at the University of Córdoba, Argentina.

One year after the museum opened, the government reduced his wage to one third, and three months later it was announced that he would not be paid anymore for his job.