Page 82, line 22, for vibrate, read oscillate.
84, 4, for parallelopedal, read paralloriped.
85, 29, for quantity, read quality.
88, 5, for parallelium, read parallelism.
27, for harp-unisons, read harp, unisons.
89, 7, for repulsing, read repelling.
90, 24, for place, read plane.
95, 6, for Baden Bowell, MA. read Baden Powell, MA.
215, 14, from bottom, for 100 feet, read 1000 feet,
218, 14, for Dex, read Dax.
232, 15, for New England, read Connecticut.
299, 10, for alternatis, read alternis.
371, 6. for mean of result, read mean of his result.
24, for potash, read alkali.
The notice respecting the Correctness of the Greenwich Observations inserted in p. 397, and signed X. should have had the signature of “ James South, Blackman-street."