This quote is from page 54 of Classical Medical Astrology – Healing with the Elements by Oscar Hofman, published by Wessex Astrologer 2009.
“There is a remarkable parallel between the planets as the seven dynamic forces of creation and the seven most important glands in the body. Glands are pre-eminantly the contact points between the psyche and the body and they have an important overall function in the human body/mind system. The seven planetary forces are expressed in these glands, and they are the points at which the planets clearly touch the human organism. In top-down order these important glands are: pineal gland, pituitary gland, thyroid gland, thymus, pancreas, adrenal glands and sexual glands.”
Oscar goes on to explain how this top-down order corresponds with the top-down order of the planets, beginning with Saturn and following the Chaldean order down to the Moon.
This is one of the best and easiest to read books on medical astrology that I have encountered.