There is perhaps no more fascinating story in the history of science than that of the discovery of these so-called ductless glands.
"The Evolution of Modern Medicine" by William Osler
Scientific research into the functioning of the ductless glands and their secretions throws a new light on this problem.
"The Pivot of Civilization" by Margaret Sanger
The Spleen and Other Ductless Glands.
"A Practical Physiology" by Albert F. Blaisdell
This behavior is caused by the capture, storage and release of energy through the ductless glands.
"Crime: Its Cause and Treatment" by Clarence Darrow
Sometimes those which do nothing but furnish these secretions are spoken of as "ductless glands," from their structure.
"Taboo and Genetics" by Melvin Moses Knight, Iva Lowther Peters, and Phyllis Mary Blanchard
It is only comparatively recently that the functions of other ductless glands have been discovered.
"The Last Harvest" by John Burroughs
More detailed study, however, has shown that other ductless glands are probably also concerned in the etiology.
"Psychotherapy" by James J. Walsh