Obvious typos and printer errors have been corrected without comment. In addition to obvious errors, the following changes have been made:
Page 18: "Idea" changed to "Ideas" in the phrase, "... forming Concepts or General Ideas."
Page 71: "infuoria" changed to "infusoria" in the phrase, "... the microscopic infusoria...."
Page 135: "disciple" changed to "discipline" in the phrase, "... necessity of discipline for invention...."
Other than the above changes, no attempt has been made to correct common spelling, punctuation, grammar, etc. The author's usage is preserved as printed in the original publication.