Side notes have been taken from the page headers and moved to the beginnings of paragraphs or, where more appropriate, to the beginnings of sentences in the text.

page [xi]Litle replaced with Little in "Little Darwin learns a new word"
page [5]space added between The and familiar "The familiar voice of his mate"
page [124]freindship replaced with friendship in "which seems to indicate friendship."
page [216]full stop added after "does not continue through the vowel".
page [231]every replaced with very in "Their means of communication are very contracted,"
page [232]sigmata replaced with stigmata in "scratching by means of their stigmata,"

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