AtD "different utterances of the same principle"

[Lemuel Underwing]

Tho I am but novitiate when it comes to AtD I was rereading and found this
wonderful line where Merle, drunkenly, supposes Blinky Morgan and the
Michelson-Morley experiments are connected:

"Not that one would *cause* the other, exactly, but that both would be
different utterances of the same principle."

p61  (italics mine)


I would just like to hear the List riff on this a bit.. my own thoughts are
undeveloped, but it seems that  "different utterances of the same
principle" is a more fore-grounded theme in the novel (Renfrew Werfner
comes into mind), but are there any Connections less obvious?
What principle is he talking about?
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