Below are all of the known references to the Law of Disintegration in the writings of Alice A. Bailey (AAB) and Djwhal Khul (DK). Links on these pages of the Laws of Alice A. Bailey are to the online books at the Lucis Trust website.
For a discussion of what AAB means by a “law” please see Alice A. Bailey – What is a Law?
II. There is a basic law called the Law of Periodicity.
1. This law governs all manifestation, whether it is the manifestation of a solar Logos through the medium of a solar system, or the manifestation of a human being through the medium of a form. This law controls likewise in all the kingdoms of nature.
2. There are certain other laws in the system which are linked with this one; some of them are as follows:
c. The Law of Disintegration.
3. The Law of Disintegration. On the third plane comes the final casting-off, the ultimate shedding of the sheaths, of the fivefold superman. A Chohan of the sixth Initiation discards all the sheaths beneath the monadic vehicle, from the atmic to the physical.
3. The Law of Disintegration.—This is the law that governs the destruction of the form in order that the indwelling life may shine forth in fullness. It is another aspect of the Law of Cohesion—the reverse side (if one might so express it), and is just as much a part of the divine plan as that of attraction. It is one of the laws that ends with the solar system, for the great laws of attraction, cohesion and love last on into that which is to come. The Law of Disintegration has its correspondence in cosmic law, but it is almost incomprehensible to us.A Treatise on Cosmic Fire , I. THOUGHT FORMS – Part 2