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an Equation unknown to them, and grounded upon a certain natural Cause which they have never described. That Equation is so considerable, that in Calculations, tho' otherwise most accurate, and amended by the Tables which [[ye?]] Publick expects from the indefatigable pains and Industry of Dr [[underline]]Halley[[/underline]] and of Mr. Professer [[underline]]Bradley[[/underline]]; yet this natural Error to which are liable [[ye?]] Calculations built upon Observations made at Land or at Sea, might amount even to some Degrees, in the Determination of the Longitude of the Place of Observation. 

24. The utmost Diligence and Accuracy will be required in establishing every one of the [[underline]]Data[[/underline]] which must enter our Calculations; unless we chuse to leave the nicest Determination of the Sun's Parallax to the Industry and Diligence of another Age.

N. Facio [[underline]]Duillier.
Worcester[[/underline]], Oct. 5, 1737.(Gents. Mag. p. 611.1737.)

Transcription Notes:
Does 'y' with 'e' above appear on other pages? Is it an abbreviation? Is this Nicolas Fatio de Duillier? Good question. This name appears on other pages as well.