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law-governed parts and its co-operation of beings and things, was not made suddenly or out of hand. It has grown out of that which has probably existed eternally. Slowly, as the seed matures in the ground and prepares the way for the bursting bud and the blooming plant, everything in nature, so far as we know, from the raising of continents to the development of man, has taken place and reached its present condition by insensible degrees. Today is the product of yesterday, and yesterday of the day before, and so on indefinitely. Each cause is the effect of another cause more remote. The life of the tree comes from the sun millions of miles away, but it comes through something. Its energy is stored in the organic and inorganic materials immediately surrounding the tree, and through the heat and light transformed from the solar rays by the earth's atmosphere. The immediate environment, ancestry, and experience give rise to all living things; and all life finds its origin in a single environment. Evolution is the only law yet discovered which in any way accounts for the origin of our world in its present form. When one pauses to consider what this law is as a universal principle, it becomes evident that there could be no other.

Yet it is easy to misunderstand this principle. To many evolution simply means the derivation of man from some lost ancestor, a belief which