TRANSCRIBER'S NOTE:
Obvious typos and printer errors have been corrected without comment. Other than obvious errors, the spelling, grammar, and use of punctuation are preserved as they appear in the original publication.
Internal inconsistencies in the original publication have not been corrected in this version but are preserved as originally printed. These inconsistencies include:
Inconsistent hyphenation (postoffice/ post-office; mind reading/ mind-reading)
References on page 89 to the "[Sperry]" children refer to the "[Creery]" experiments mentioned on page 15.