Chapter 23: removed duplicate 'in' from

... and pushed in in its middle ...
Footnote 163 - added final 's' to 'Nervensystems'
Fig. 100 - added 'yolk' as definition to abbreviation 'yk.' in caption
Fig. 191 - 'Mc' to 'Me' in reference to ventral surface
Fig. 390 - 'Malphigian' to 'Malpighian' in 2nd paragraph of caption
Fig. 416 - removed italics from 'thyroid involution' for consistency
Bibliography item (139) - 'Hünchens' to 'Hühnchens'
Bibliography item (168) - 'Jhiere' to 'Thiere'
Bibliography item (466) - 'Brustbien' to 'Brustbein'

Anomalies noted, but left unchanged:

Periods after abbreviations of Mr., Dr., St., etc. were omitted.
Abbreviations in the captions usually conclude with a period, which
is missing in most illustrations, and is usually missing in the text
discussing the illustration; occasionally, periods are used in the
abbreviation in the illustration, but not in the caption.
Fig. 73 - reference to 'medullary canal' in text is shown as 'neural
canal' in the figure.
Fig. 113 - the abbreviation for neural canal is identified in the
illustration as "m.c."
Fig. 324 - 'Iaa' in caption doesn't match 'laa' in illustration.
Fig. 148 - abbr 'a.' is used for both amnion and urachus in the caption
and illustration.
Bibliography header is missing between Footnote 157 and reference (327).
Bibliography item (208) does not have a series or volume number
identified in the original.
There are no bibliography items numbered (358) or (359).