Transcriber's Note
Illustrations have been moved alongside the text which they illustrate, and may no longer match the locations given in the List of Illustrations.
The following apparent errors have been corrected:
- p. vii "FIG" changed to "FIG."
- p. viii "Mr" changed to "Mr."
- p. 29 "Figs. 9" changed to "Fig. 9"
- p. 34 (note) "on" changed to "of"
- p. 50 (footnote) "p 88" changed to "p. 88"
- p. 72 (note) "(1898)" changed to "(1898)."
- p. 107 (note) "405" changed to "405."
- p. 131 "219" changed to "219."
- p. 131 (note) ">Pfluger’s" changed to "Pflüger’s"
- p. 162 (note) "p 44" changed to "p. 44"
- p. 165 "Mullerian" changed to "Müllerian"
- p. 212 "Where-ever" changed to "Wherever"
- p. 216 "79" changed to "79."
- p. 226 "drives" changed to "drive"
- p. 239 (note) "G. F" changed to "G. F."
- p. 256 "objects" changed to "objects."
- p. 267 "woes" changed to "woos"
- p. 330 (note) "239" changed to "239."
- p. 332 "co ordinated" changed to "co-ordinated"
- p. 338 "106." changed to "106"
- p. 338 "Beckstein" changed to "Bechstein"
- p. 338 "leafcase" changed to "leaf-case"
- p. 339 "nerve centres" changed to "nerve-centres"
- p. 341 "nerve centres" changed to "nerve-centres"
- p. 341 "king crab" changed to "king-crab"
- p. 341 "of, intelligence" changed to "of intelligence"
- p. 342 "on, infusoria" changed to "on infusoria"
- p. 342 "mating, instinct" changed to "mating instinct"
- p. 343 "Schneider on" changed to "Schneider, on"
- p. 343 "Shock effects" changed to "Shock, effects"
- p. 343 "Spence on" changed to "Spence, on"
- p. 344 "106." changed to "106"
- p. 344 "of 327" changed to "of, 327"
- p. 344 "72 ff.," changed to "72 ff.;"
Punctuation and spelling have otherwise been kept as printed.
The following are used inconsistently in the text:
- alarm-note and alarm note
- co-existed and coexists
- co-incident and coincident
- danger-note and danger note
- first-hand and firsthand
- fox-terrier and fox terrier
- ground-work and groundwork
- inter-communication and intercommunication
- newly-hatched and newly hatched
- non-plussed and nonplussed
- play-time and playtime
- pre-requisite and prerequisite
- re-presentations and representations
- re-presentative and representative
- Romanes’s and Romanes’
- supra and supra
- Venus’s Fly-trap, Venus’s Fly Trap and Venus’s fly-trap