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Transcriber's Note

Minor typographic errors and hyphenation and accent inconsistencies
have been corrected without note.

The footnote marker on page 267 was originally located next to the
EXPERIMENTS heading, but the footnote itself referred to a dissecting
pin. The marker has been moved next to the reference to a dissecting
pin in the text.

The experiments are consecutively numbered, and Experiment Nos. 28 and
29 are missing. There do not appear to be any missing pages--the page
numbering has no gaps, and Experiment No. 27 runs across a pa