"They may act by changing the distribution of gases," said Marrables; "instruments are getting so fine now, men may come to register the spread of a theory by observed changes in the atmosphere and corresponding changes in the nerves."

"They may act by changing the distribution of gases," said Marrables; "Instruments are getting so fine now, men may come to register the spread of a theory by changes in the atmosphere and corresponding changes in the nerves."
