different between therealong vs wherealong

English

where +? along

wherealong

(rare) Along which.
- 1768-1777, Abraham Tucker, The Light of Nature Pursued
  Magnitude, figure, and motion, are reputed both by learned and vulgar to reside in the bodies wherein we observe them : yet it cannot be denied, that the suffer alterations in their conveyance to the mind, whether that be made through the sight, or the touch; they being all motion in the rays of light, the organs or other channels wherealong they pass, and that a different kind of motion from any in the bodies themselves.

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