All known references to the Law of Adaptation (in Time) by Alice A. Bailey (AAB) in her voluminous writings and those given to her by Djwhal Khul (DK). Links on these pages of The Laws of Alice A. Bailey are to the online books at the Lucis Trust website.
AAB’s definition of a law:
“a law is but the effect of the continued intelligent activity of the Life aspect as it works in conjunction with matter.”
This fire is the basic vibration of the little system in which the monad or human spirit is the logos, and it  holds the personality or lower material man in objective manifestation thus permitting the spiritual unit to contact the plane of densest matter. It has its correspondence in the ray of intelligent activity and is controlled by the Law of Economy in one of its subdivisions, the Law of Adaptation in Time.