Changed "pullies" to "pulleys" on page 64: "a system of pulleys."

Changed "twelves" to "twelve" on page 65: "twelve times less."

Changed "stream" to "steam" on page 66: "expansive force of steam."

Changed "Pray Mrs. B," to "Pray, Mrs. B.," on page 68.

Changed "nonelastic" to "non-elastic" on page 70: "non-elastic like water."

Removed extra comma after "one" on page 73: "one would ultimately have prevailed."

Changed "eliptical" to "elliptical" on page 73: "elliptical or oval orbit."

Changed "eclipse" to "ellipsis" on page 73: "motion in an ellipsis."

Changed "elipsis" to "ellipsis" on page 75: "but an ellipsis."

Changed "fig. 4 plate 3" in the question on page 75 to "fig. 4. plate 6" to designate the correct figure.