Underscores surround text in italics, _like this_. Raised dots in
numbers were converted to decimals. Superscript letters are enclosed in
braces, e.g. P{1}.
Use of periods and commas in the abbreviations within and referring to
illustrations is inconsistent. Often punctuation marks do not match the
illustrations to which they refer. Periods were retained; commas
were added to separate figure numbers from abbreviations within the figure.
Spacing within the abbreviations was standardized. Occasionally,
identification marks referenced in the text do not match the illustration
(for example, discussion of Figure 10, Plate 2, where epiblast is identified
with _e_ in the text, but with E in the illustration).
Footnotes were renumbered sequentially, indented, and moved to follow the
paragraph or section in which the anchor occurs.
Other changes:
Footnote 4: 're-agent' to 'reagent'
Explanation of Plates, Plate 35, Figures 26-27: 'Tranverse' to 'Transverse'