The result of their advent , millions of years ago, was stupendous, and its effects are still being felt. Those effects might be enumerated as follows:- The Planetary Logos on His own Plane was enabled to take a more direct method in producing the results He desired for working out His plan. as is well known, the planetary scheme, with its dense  globe and inner subtler globes, is to the Planetary Logos what the physical body and its subtler bodies are to man.

Hence in illustration it might be said that the coming into incarnation of Santa Kumara was analogous to the firm grip of self-consciousness  control that the Ego of a human being takes upon his vehicles when the necessary stage in evolution has been achieved. It has been said that in the head of every man are seven centres of force , which are linked to the other centres in the body, and through which the force of the Ego is spread and circulated, thus working out the plan.

Sanat Kumara, with the six other Kumaras, holds a similar position. These central seven are as the seven head centres to the body corporate. They are the directing agents  and the transmitters of energy, force, purpose, and will of the planetary Logos on His own plane. This planetary head centre wwworks directly through the heart and throat centres, and thereby controls all the remaining centres. This is by way of illustration, and an attempt to show the relation of the Hierarchy to its planetary source, and also the close analogy between the method of functioning of a planetary Logos and of man, the microcosm.

The third kingdom of nature, the animal kingdom, had reached a relatively high state of evolution, and animal man was in possession of the earth;he was a being with a powerful physical body, a co-ordinated astral body, or body of sensation and feeling, and a rudimentary germ of mind which might some day  form a nucleus of a mental body. Left to himself for long aeons animal man would have eventually progressed out of the animal kingdom  into the human, and would have become a self-conscious, functioning, rational entity, but how slow the progress would have been  may be evidenced by the study of the bushmen of South Africa, the Veddhas of Ceylon, and the hairy Ainus .

The decision of the Planetary Logos to take a physical vehicle  produced an extraordinaary stimulation in the evolutionary process, and by his Incarnation, and the methods of force distribution He employed, He brought about in a brief cycle of time what would otherwise have been inconceivably slow. The germ of mind in animal man was stimulated. The fourfold lower man,
a. The physical body in its dual capacity, etheric and dense
b.Vitality, life force or prana
c.The astral or emotional body
d.The incipient germ of mind.

was co-ordinated and stimulated, and became a fit receptacle for the coming in of the self-conscious entities, those spiritual triads (the reflection of spiritual will, intuition, or wisdom, and higher mind) who had for long ages been waiting for just such a fitting. The fourth, or human kingdom, came thus into being, and the self-conscious, or rational unit, man, began his career.

Another result of the advent of the Hierarchy was a similar, though less recognised development  in all the kingdoms of nature. In the mineral kingdom, for instance, certain of the minerals or elements received an added stimulation, and became radioactive, and a mysterious chemical change took place in the vegetable kingdom. This facilitated the bridging process between the vegetable and animal kingdoms, just as the radio-activity of minerals is the method of bridging the gulf between the mineral and vegetable kingdoms. 

In due course of time scientists will recognise that every kingdom in nature is linked and entered when the units of that kingdom become radioactive.  But it is not necessary for us to digress nalong these lines. A hint suffices for those who have eyes to see, and the intuition to comprehend the meaning conveyed by terms which are handicapped by having a purely material connotation.

In the Lemurian days, after the great descent of the spiritual Existences to the earth, the work They planned to do was systematised. Offices were apportioned, and the proces of evolution in all the departments of nature were brought under the conscious wise guidance of this initial Brotherhood.This Hierarchy of Brothers of Light still exists, and the work goes steadily on. They are all in the physical existence, either in dense physical bodies, such as many of the Masters employ, or in etheric bodies, such as the more exhalted helpers and the Lord of the World occupy.

It is of value for men to remember that They are in physical existence, and to bear in mind that They exist upon this planet with us, controlling its destinies, guiding its affairs, and leading all its evolutions on to an ultimate perfection. The central home of this Hierarchy is at Shamballa, a centre in the Gobi desert, called in the ancient books the "White Island". it exists in etheric matter, and when the race of men on earth have developed etheric vision its location will be recognised and its reality admitted.

The development of this vision is rapidly coming to pass, as may be seen  from the newspapers and the current literature of the day, but the location of Shamballah will be one of the latest etheric sacred spots to be revealed as it exists in the matter of the second ether. Several of the Masters in physical bodies dwell in the Himalaya mountains, in a secluded spot called Shigatse, far from the ways of men, but the greater numbers are scattered all over the world, dwelling in different places in various nations, unrecognised and unknown, yet forming each in His own place a focal point for the energy of the LOrd of the World, and proving to His environment a distributor of the love and wisdom of the Deity.

Reference: Initiation Human and Solar: Alice. A. Bailey