THEORIES AND CONCLUSIONS 
and the many complicated outside forces or 
environments. To guide the interaction of 
these two forces, both of which are only 
different expressions of the one eternal 
force, is, and must be, the sole object of the 
breeder, whether of plants or animals.” 
He speaks of a vital Principle. He does 
not attempt to establish its essence or 
identity, but he says: 
“When simple cells become joined together, 
mutual protection is assured, and we know 
that they exhibit organized forces in new 
directions which were impossible by any 
of the individual cells not associated in a 
cell-colony with its fellows. These cell- 
colonies will, if environment is favorable, 
increase in strength, while colonies less favor- 
ably situated may be crippled or destroyed. 
We see this natural selection in all life, every 
day all around us. But this is only one of 
the many forces at work in the upward, 
outward and onward movement of life.” 
Other men who have gone deeply into 
the inner life of Nature have given the 
world elaborate systems by which to account 
for and interpret many of the acts of Nature. 
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