The building of the physical bodies begins with the formation of the minerals. As a mineral body is formed, perhaps some crystal, the crystal of an element or a salt, a definite form is built up by a Deva of the physical plane. He takes up the material of his own body and such material of the physical plane as is of similar nature to himself, and he begins shaping these crystalline forms. He builds them on the lines of the life-energy sent out by Íshvara Himself, those lines which Science calls the axes of the crystal, "imaginary" lines; "imaginary"--aye; but they are from the creative imagination of Íshvara, that is far more potent than the lower matter in which He builds. That lower matter follows the creative imagination of the Lord, and these imaginary lines govern the shaping of that crystal that is builded by the Deva. Tyndall believed not in the working of the Devas, yet when he was lecturing on crystals to a popular audience in Manchester he declared that as he pictured to himself the building of a crystal, he found himself imagining tiny architects at work, placing every atom with exact precision, with all the intelligence and skill of a human architect, employed in making a building. Tyndall was speaking better than he knew. His imagination was answering to the truth more keenly than he realised. For it is the privilege of the man of genius who loves truth as Tyndall did--who was willing to break up every fetter of dogma rather than be a traitor to his conception of truth--to unconsciously intuit the truth that he seeks, so that his words give out a higher meaning than he dreamed of. Tyndall was wise in recommending what he called the scientific flight of the imagination, for that power of imagination is a most useful thing. Never clip the wings of your imagination when you are employed in your scientific work; for it may often give you glimpses of truths that without its aid you would never find. Thus the Devas work and build crystals, and those crystals have some remarkable properties. Professor Japp tells us that some crystals turn a polarised beam of light in a particular way; and he declares that in some of these forms there is a power which is directive and somewhat akin to the intelligence of man. Truly is it akin to human intelligence, inasmuch as it is the parent of human intelligence, the latter being the child that is developing the parental powers. This building goes on through stages on which we must not tarry, through the whole of the mineral world, gradually giving to matter the power to change shape between larger and larger limits without losing cohesion. This is what is called plasticity, the power of changing shape without disintegration. Matter also gains that which science speaks of as elasticity. Now what is elasticity? Not, as people generally think the mere power of elongation, calling a thing elastic that can be pulled out like a piece of India-rubber. An elastic