All misspellings in the text, and inconsistent or archaic usage, have been retained: for example, unfrequent; clayey; friable; slaty; imbed; stoped; peculation; situate.
In the [Table of Contents], the Index page number ‘145’ has been replaced by ‘141’.
In the [Index], ‘Colesberg Copje’ has been replaced by ‘Colesberg Kopje’, and ‘DeBeers’ has been replaced by ‘De Beers’.