Obvious typographical errors have been silently corrected. Variations
in hyphenation and accents have been standardised but all other
spelling and punctuation remains unchanged.
Temperatures ranges, variously expressed as 54°-55°, 54°, 55° and 54°
55°, have been standardised as 54°-55°. Fractional temperatures have
been standardised as XX.X°
Italics are represented thus _italic_, superscripts thus y^n, subscripts
as y_{n}.