Transcriber’s Notes:
New original cover art included with this eBook is granted to the public domain.
Footnotes have been moved to the end of the text and relabeled consecutively through the document.
Punctuation has been made consistent.
Variations in spelling and hyphenation were retained as they appear in the original publication, except that obvious typographical errors have been corrected.
The following change was made:
[p. 84]: standstone changed to sandstone (homogeneous sandstone. There)