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The change that has taken place is therefore a very notable one. I have no such sufficiently intimate knowledge of the subject as would justify me in linking together the two changes I have noticed in the connection of cause and effect. I only note the synchronism.
There seems, then, no escape from the admission that neither physical geology, nor paleontology, possesses any method by which the absolute synchronism of two strata can be demonstrated. All that geology can prove is local order of succession.
The use of the word "homotaxis" instead of "synchronism" has not, so far as I know, found much favour in the eyes of geologists.
They were not restricted, even, to a regular route, when their subject took them out of it. They could have a glimpse of Memphis, or Babylon, or Alexandria, or Athens, by way of following out an allusion or synchronism.
After a contest in which the very foundations of faith seemed to be removed, it was to afford a basis for a belief in Scripture and revelation as positive and secure as any which men ever enjoyed, with the advantage that it is a foundation upon which the modern man can and does securely build. The synchronism of the two endeavours is remarkable.
It is well known that the vibration of a heavy unit is accompanied by a synchronous or non-synchronous vibration of the foundation upon which it rests. The nearest approach to perfect synchronism between unit and foundation is obtained by a gradual rise in speed.
These steel rods fixed at one end vibrated with equal periods, and could be utilised in such a way that the printing wheel could be corrected into absolute synchronism by each signal current. In 1854, Professor Hughes went to Louisville to superintend the making of his first instrument; but it was unprotected by a patent in the United States until 1855.
Homotaxis is not to be held identical with synchronism without independent evidence. It is possible that similar, or even identical, faunae and florae in two different localities may be of extremely different ages, if the term "age" is used in its proper chronological sense.
The synchronism remains to be fully established by palæontological proofs. He thinks he has been able to fix upon the true point of division between the Mesozoic and Cenozoic ages, and to prove that coal was deposited through about 7,000 feet of Cretaceous and about 4,500 feet of Cenozoic beds. Mr. Powell's literary style is excellent not involved, but clear and energetic.
Shall we say with Locke that there are two sources of our ideas, sensation and reflection; that the mind cannot know things directly, but only through ideas? Shall we suggest with Leibnitz that reflection is nothing more than attention to what is passing in the mind, and that between the mind and the body there is a sympathetic synchronism?
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