Periods and commas of letter-spaced capitals should not be set off from the last letter of the word, regardless of the amount of spacing used elsewhere in the line.
Colons and semicolons have traditionally been set apart from the word they follow, whether in capitals or lower case. In old books they are frequently centered in the space between the words where they occur. Exclamation and interrogation points should if possible be set off with thin spaces because they often form disagreeable and confusing combinations with the last letter of the word, such as ff!, ll!, f?, etc.
COMPOSED IN CENTAUR AND ARRIGHI TYPES
FOOTNOTES:
[36] Of the more than half-thousand books that Mr. Rogers has designed, only four come to mind as having the text matter printed in anything other than black; and these four were all slight volumes, more or less in the gift-book classification.
[37] "When we look at his books we think of Baskerville; while to look at the work of Jenson is to think but of its beauty, and almost to forget that it was made with hands!" UPDIKE, Printing Types, II, p. 116.