Published online by Cambridge University Press: 15 September 2014
The pineal body or epiphysis has provided a favourite subject of study for many workers at research, and much discussion has arisen with regard to both its ontogeny and its phylogeny. Up to within recent years this structure proved a sort of enigma, and its true significance was not really understood until the researches of De Graaf (15) and Baldwin Spencer (27) during the eighties. Since then an extensive amount of work has been published on the subject, so that it almost appeared quite unnecessary for one to again enter upon this field of research.