It might be supposed to be a chronogram, but for the introduction of the letter "E."
The Acrostic and the chronogram are both ingeniously described in the mock epic of the Scribleriad.
If not, I can only make Howell's chronogram equivalent to 1927.
There is another near relation of the anagrams and acrostics, which is commonly called a chronogram.
Webster defines a chronogram as an inscription, sentence, or phrase in which certain letters express a date or epoch.
The red letters undoubtedly compose a chronogram; E in such compositions represents 250.
The date may sometimes occur as a chronogram, which should not be overlooked.
The first of these lines is a chronogram, that is, it contains a date.
Sometimes it is to be found at the end of the preface or dedication, and sometimes it is on the title-page as a chronogram.