tops of the
original pages. These may be searched for to locate the material
referred to. In the main section, these page markers are always given
with 3 digits including, if necessary, leading zeroes.

This book contains a large number of line drawn illustrations which are
un-credited. As these cannot be rendered here in the original manner
they have been reproduced as well as possible in the manner known as
"ASCII art".

In this ASCII file, the greater-than symbol (>) has bee substituted
for the Pilcrow symbol.

A number of transcription errors were found in the original book. As
these were clearly not part of the Author's intention they have, as far
as possible, been identified and corrected in accordance with the
methods given by the Author. These corrections are listed here below
with their locations and original text. In these notes the word
'natural' identifies a letter symbol occurring without a prime mark.

Page viii: "189" corrected to "194".
Page viii: "188" corrected to "192".
Page xv, '=Real=' and '=Unreal=', or '=Imaginary=', Classes: "1 1/2"
corrected to "2".
Page xix, Propositions beginning with "Some": "18" corrected to "19".
Page xix, Rules: "19" corrected to "20".
Page xix, The West and East Halves ...: "24" corrected to "23".
Page xxi, The Proposition "All x are y" ...: was originally shown as
occurring in page 34.
Page xxii, And of three other similar arrangements: "37" corrected to
"36".
Page xxiii, The Proposition 'No xm exist': "43" corrected to "44".
Page 060: "contruct" corrected to "construct".
Page 094, Paper V: missing word "it" supplied.
Page 111, #28: "No h are k-natural" corrected to "No h are k-prime".
Page 111, #30: "No a are h-natural" corrected to "No a are h-prime".
Page 111, #30: "No c are n-natural" corrected to "No c are n-prime".
Page 123, #57 (d): "mortally offended if I fail to notice them"
corrected to "mortally offended".
Page 128, #34: "Some x-prime are y" corrected to "Some x-natural are y".
Page 146, #30: "x_{1}m-prime_{0}" corrected to "x_{1}m-natural_{0}".
Page 147, #32: "xm-natural_{0}" corrected to "xm-prime_{0}".
Page 156, #18 (4/1): "be" corrected to "be-sub:zero".
Page 156, #22 (5/1): "ch" corrected to "ch-sub:zero".
Page 157, #23 (5/2): second underline corrected from single to double.
Page 157, #23 (2/2): first underline corrected from single to double.
Page 157, #23 (>2): "h_{1}c" corrected to "h_{1}c-sub:zero".