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Transcriber notes:
Fixed various punctuation.
P.[47]. 'to +5.93' may be 'to +:+5.93', however leaving it.
P.[47]. 'for eyes at 0' added a degree like the others.
P.[272]. 'abcab, cabe', changed 'cabe' to 'cabc 'as there is no 'e' and it looks to be 'c'.
P.[313]. 'obseved' changed to observed.
P.[400]. (b) 'irrevelant' changed to 'irrelevant'.
Footnote 128: 'Wahrscheinlichkeitseechnung' changed to 'Wahrscheinlichkeitsrechnung'
P.[550]. Added closing quotation at: is markedly thinner."
P.[551]. 'under expermental' changed to 'under experimental'.
Footnote 141. 'Woods Holl' changed to 'Woods Hole'.
P.[583]. 'thoughout' changed to 'throughout'.
P.[594]. Fig. 4. 'The rise curve' changed to 'The rise on curve'.
P.[606]. 'mimimize' changed to 'minimize'.
Note: Carat followed by { } indicates superscription.