Which astronomer, operating at the Harvard College Observatory, was unable to verify the existence of the canals seen by Lowell?

Answer

Edward C. Pickering

Many contemporary astronomers, such as Edward C. Pickering at the Harvard College Observatory, using equipment comparable to or better than Lowell’s, simply could not verify the existence of the canals.

Which astronomer, operating at the Harvard College Observatory, was unable to verify the existence of the canals seen by Lowell?
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