Printed byT.andA. Constable, Printers to His Majestyat the Edinburgh University Press, Scotland
Transciber's Notes:Some obvious typographical errors and inconsistencies corrected.Footnotes moved to end of chapter.Table of Contents: slightly expanded to include all named sections.Page 39: footnote anchor and number before paragraph removed.Page 43: CaptionFig. 18.added.Page 43: comma added:or better, ...Page 46:DE through Echanged toDEthroughE.Page 66:leadchanged toleak.Page 70:endiometerchanged toeudiometer.Figure 20 (C): added letterdto illustration.