Foreword

Here are a few notes concerning this electronically prepared document.

What I did: Because the original was brittle and brown, I xeroxed the entire document, often tweaking the brightness or contrast. I then scanned the document from the cleanest xerox copies using a flatbed scanner, I ran the pages through OCR software, ran a spell checker, and then manually read and edited problem areas. I lost most tables in scanning, and so re-typed these. I then scanned the figures, and copied them into the appropriate places in the document. Although I tried to preserve the accuracy of the original document, it's possible that I introduced some typos or other errors. I apologize for any that you may find. (I also changed some of those annoying British spellings like "vapour").

Figures: Figures are always in place, although the numbering scheme differs from the original manuscript because the author made heavy use of a plate numbering system that was difficult to follow and that allowed figures to float too far from the referring text. I've tried to keep figures close to the point in the text at which they are discussed and to use a single numbering system. If you ever see this paper cited in the literature, be aware that figure, table, and page numbers are different in this version as compared to the original.

Diacritical marks: Linguistic purists like seeing diacritical marks, however, they present logistical problems. My OCR software does not recognize the various accent marks, umlauts, cedillas, or other diacritical marks that are used in the text. I also had no desire to go through the manuscript manually, putting them in where they belonged, so I left them out (since I don't really like them anyway). However, in the interest of justice to those who do appreciate them, here are some words that did have diacritical marks:

About copyright: Because the document was written in 1881, it's statute copyright has long since expired. Any work I have done on this document that might be normally be entitled to copyright protection is explicitly placed in the public domain.

If you have any other questions about this document, please let me know. I can be reached via e-mail to [email protected]

Cheers!

---Mark Stevens January 1996

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