- It is
quite conceivable that life belongs to a limited stretch of time; that before the earliest geologica
l ages it did not exist, and that the time may well come when the earth is again a lifeless, burnt-out, or frozen planet. To those of us who are aware of the extremely limited range of physical c
- onditions under which the chemical reactions necessary to life as we know it can take place, it is a fore
gone conclusion that the lucky accident which permits the continuation of life in any form on earth, eve
- n without restricting life to something like human life, is bound to come to a complete and disastrous end.
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