The living cell is a wonderful machine, but if we ask which is first, life or the cell, where are we?  There is the synthetical reaction in the cell, and the analytical or splitting reaction—­the organizing, and the disorganizing processes—­what keeps up this seesaw and preserves the equilibrium?  A life force, said the older scientists; only chemical laws, say the new.  A prodigious change in the behavior of matter is wrought by life, and whether we say it is by chemical laws, or by a life force, the mystery remains.

The whole secret of life centres in the cell, in the plant cell; and this cell does not exceed .005 millimetres in diameter.  An enormous number of chemical reactions take place in this minute space.  It is a world in little.  Here are bodies of different shapes whose service is to absorb carbon dioxide, and form sugar and carbohydrates.  Must we go outside of matter itself, and of chemical reactions, to account for it?  Call this unknown factor “vital force,” as has so long been done, or name it “biotic energy,” as Professor Moore has lately done, and the mystery remains the same.  It is a new behavior in matter, call it by what name we will.

Inanimate nature seems governed by definite laws; that is, given the same conditions, the same results always follow.  The reactions between two chemical elements under the same conditions are always the same.  The physical forces go their unchanging ways, and are variable only as the conditions vary.  In dealing with them we know exactly what to expect.  We know at what degree of temperature, under the same conditions, water will boil, and at what degree of temperature it will freeze.  Chance and probability play no part in such matters.  But when we reach the world of animate nature, what a contrast we behold!  Here, within certain limits, all is in perpetual flux and change.  Living bodies are never two moments the same.  Variability is the rule.  We never know just how a living body will behave, under given conditions, till we try it.  A late spring frost may kill nearly every bean stalk or potato plant or hill of corn in your garden, or nearly every shoot upon your grapevine.  The survivors have greater powers of resistance—­a larger measure of that mysterious something we call vitality.  One horse will endure hardships and exposures that will kill scores of others.  What will agitate one community will not in the same measure agitate another.  What will break or discourage one human heart will sit much more lightly upon another.  Life introduces an element of uncertainty or indeterminateness that we do not find in the inorganic world.  Bodies still have their laws or conditions of activity, but they are elastic and variable.  Among living things we have in a measure escaped from the iron necessity that holds the world of dead matter in its grip.  Dead matter ever tends to a static equilibrium; living matter to a dynamic poise, or a balance between the intake and the output of energy.  Life is a peculiar