p. ??. “(Ex. 2.) …or touchlng a given file and a given circle.” in original, obvious error amended to “touching”.
p. ??. “21. What is the locus of the middle points …” in original, amended to “31.” in sequence.
p. ??. In (21) “the if then line DE intersect the chords …” in original, garbled phrase amended to “then if the”.
p. ??. In (44) “these circle sintersect” in original, misplaced space amended to “these circles intersect”.
p. ??. “4. The point of bisection (1) of the line (OP)” in original, from the diagram and following discussion this should be (I).
p. ??. Prop. IX. “About a given circle (ABCD) to describe a circle.” in original, clearly this is nonsense and must mean “About a given square”.
p. ??. “Then the traingles ABO, CBO” in original, obvious error amended to “triangles”.
p. ??. In (52) “and also en equilateral circumscribed polygon” in original, wrong letter amended to “an”.
p. ??. Heading “PROP. XXV.—Problem.” in original, the preamble to this book says that every Proposition in it is a Theorem and this one seems to be no exception, so amended.
p. ??. Reference “[I.]” is to Proposition I. of current book, amended to “[i.]” (4 times).