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22 objects of practical knowledge. Of course if it is so difficult for us to understand these different principles as they exist in nature, it will be still more difficult for us to form any definite idea as to their basis. But at any rate the evolution and the work of differentiation of these principles is a matter which appertains more properly to the science of physics than to the science of spiritual ethics,and the fundamental principles that I have laid down will suffice for our present purpose. You must conceive, without my going through the whole process of evolution, that out of these three principles, having as their one foundation Mulaprakrti, the whole manifested solar system with all the various objects in it has started into being. Bear in mind also that the one energy which works out the whole process of evolution is that Light of the Logos which is diffused through all these principles and all their manifestations. It is the one Light that starts with a certain definite impulse communicated by the intellectual energy of the Logos and works out the whole programme from the commencement to the end of evolution. If we begin our examination from the lowest organisms, it will be seen that this one life is, as it were, undifferentiated. Now when we take, for instance, the mineral kingdom, or all those objects in the cosmos which we cannot, strictly speaking, call living organisms, we find this undifferentiated. In the course of time, when we reach plant life, it becomes differentiated to a considerable extent, and