Typographical errors have been silently corrected and hyphenation
standardised.
Variations in spelling and punctuation are as in the original.
The author has used hydroscopic in place of hygroscopic throughout.
On page 27 qualitive replaced by qualitative.
In the testimonial on page 37 beginning "I am much impressed with
(the value) of", the words in brackets are illegible in the original.
The correction is taken from the same testimonial on page 12.
The layouts of the terminal salutations in the testimonials are highly
varied in the original. They have been standardised.
In the testimonials section, the author used page headings to
describe the source of the testimonials on the page
(i.e. R. R. SURGEONS.). These headings have been placed at the
beginning of each set of testimonials.
The original volume has no table of contents. This has been added.
Italics are represented thus, _italic_.