Chapter 1.
Page I xi: page number H 29 (section The Skeleton) changed to H 28.
Page I xvii: [See also experiments with candle and breath, in Introduction to Human Biology.] and related hyperlinks changed to [See also experiments with candle and breath, in The Principles of Biology.] and relevant hyperlinks.
Page P31: Fig. B has been rotated 90°.
Page P 89: ... at their middles on either side the opening, ... changed to ... at their middles on either side of the opening, ....
Page P 91: ... the table on page =88= ... changed to ... the table on page 88 ....
Page A8: (Fig. 389.) changed to (Fig. 390.)
Page A 42: ... a test with live worm ... changed to ... a test with a live worm ....
Page A 91: Parenthesis deleted from ... Where does a Scarab (or sacred beetle ....
Page A93: Illustration caption Fig. 177 added.
Page A 94: parenthesis deleted from (Does the size of its nerve ganglia ....
Page A 143, caption with Fig. 270: ... lr, liver ... changed to ... le, liver ....
Page A 174: Describe the molting process (page 120) changed to Describe the molting process (page 157).
Page A 177: D¹ Bill hooked, ... changed to D₂ Bill hooked, ....
Page A 193: C¹ Head large; ... changed to C₁ Head large; ...; C¹ Five toes, ... changed to C₁ Five toes, ...; Dolphin (379, 397) changed to Dolphin (Figs. 379, 397).
Page A 200: (See Fig. 347.) changed to (See Fig. 349.)
Page H 17: question mark deleted from ... a cotton cloth of same weight and texture?
Page H 25: ... keeping the body cool during the exertion (Exp. o) changed to ... keeping the body cool during the exertion (Exp. 5).
Pahe H 38: ... sit far back in the chair (Figs. 60, 61, 62) ... changed to ... sit far back in the chair (Figs. 49, 50, 51) ....
Page H 54: ... blood vessels must have these three properties? changed to ... blood vessels must have these three properties.
Page H 56: Fig. 57 rotated 180°.
Page H 70: (See Animal Biology, p. 14.) changed to (See Animal Biology, p. 4.)
Page H 72: Make a model like sketch ... changed to Make a model-like sketch ....
Page H 110, Fig. 101: individual elements rotated 90° clockwise.
Page H 140 (footnote): closing quote mark inserted after ... how to harmonize color with herself.
Page H 158: parenthesis deleted after ... 200 diameters, or 40,000 areas).
Index: some page numbers corrected and book (I, P, A or H, see above) letters added.