General: Corrections to punctuation have not been individually noted.
General: Inconsistent spelling of catalog/catalogue preserved as in
original.
Page 7: magnifiing corrected to magnifying and celestrial corrected to
celestial.
Page 17: intensisy corrected to intensity.
Page 18: hundreths corrected to hundredths. LaPlatta as in original.
NB The final two pages of the book, on Astronomical, physical and
physiological Apparatus, are in a slightly different format in the
original. Particularly, prices are not in bold. That has been preserved in
this version.