Dubois also took a keen interest in the new discoveries being made in Java by Ralph von Koenigswald, and he was still commenting on—and vigorously contesting—von Koenigswald's interpretations well into his eighth decade.19, 20 As I have suggested, Dubois' research interests extended beyond paleoanthropology and vertebrate paleontology, and no doubt prompted by the relatively small endocranial volume of Trinil 2, he was one of the first researchers to systematically investigate the relationship between the size of the brain and body size.21, 22
After re-establishing himself in the Netherland, Dubois continued to write about P. erectus, and he was evidently planning a more extensive treatment of the fossils, because in 1924 Dubois18 published 32 photographic images that “are destined for a future memoir”,18 p. 30. Dubois also took a keen interest in the new discoveries being made in Java by Ralph von Koenigswald, and he was still commenting on—and vigorously contesting—von Koenigswald's interpretations well into his eighth decade.19, 20 As I have suggested, Dubois' research interests extended beyond paleoanthropology and vertebrate paleontology, and no doubt prompted by the relatively small endocranial volume of Trinil 2, he was one of the first researchers to systematically investigate the relationship between the size of the brain and body size.21, 22