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Updated: June 2, 2025
Spencer has deductively shown that, by its lineage and its kindred, the evolution-hypothesis is as closely allied with the proved truths of modern science as is the antagonist hypothesis, that of special creation, with the proved errors of ancient ignorance.
The false induction from genuine facts of observation, leading to the construction of theories which are then deductively applied in the face of the results of direct observation. The school of Broussais has furnished us with a good example of this error.
But it is at any rate conceivable, that the nature of the Deity, and his relations to the universe, and more especially to mankind, are capable of being ascertained, either inductively or deductively, or by both processes. And, if they have been ascertained, then a body of science has been formed which is very properly called theology.
But, again, we know deductively, from the laws of heat, that the contact of the air with a body colder than itself, will necessarily lower the temperature of the stratum of air immediately applied to its surface; and will therefore cause it to part with a portion of its water, which accordingly will, by the ordinary laws of gravitation or cohesion, attach itself to the surface of the body, thereby constituting dew.
He constructed his tale deductively: beginning with a general conception, he reduced it to particular terms. "Dr. Jekyll and Mr. Hyde" is, of course, a thoroughly true story, even though its incidents are contrary to the actual facts of life.
Thus, starting from the general laws of things, and the known chemical attributes of organic matter, we may conclude deductively that the homogeneous germs of organisms have a peculiar proclivity towards a non-homogeneous state; which may be either the state we call decomposition, or the state we call organization. At present we have reached a conclusion only of the most general nature.
So much she knew of herself, and states modestly: "I had discovered that I could write quickly, easily, and for long at a time without fatigue; that my ideas, torpid in my brain, woke up and linked themselves together deductively in the flow of the pen; that in my life of seclusion, I had observed a good deal, and understood pretty well the characters I had chanced to come across, and that, consequently, I knew human nature well enough to describe it."
When we think inductively, we reason from the particular to the general; and when we think deductively, the process proceeds in the reverse direction and we reason from the general to the particular.
From this it follows, deductively, that if there is already as much vapor suspended as the air will contain at its existing temperature, any lowering of that temperature will cause a portion of the vapor to be condensed, and become water.
Further, even if we could have ascertained, by the Method of Agreement, that oxygen and hydrogen were both present when water is produced, no experimentation on oxygen and hydrogen separately, no knowledge of their laws, could have enabled us deductively to infer that they would produce water. We require a specific experiment on the two combined.
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