Caveat: πoetry

I saw this at a blog I read, called JF Ptak Science Books. The guy is a dealer in old and rare books, with an emphasis on books related to the history of science and ideas. He often posts very interesting things.
He found a text of a poem published in 1905, which has an unusual constraint: each word in the poem has the same number of letters as a digit of the number π (3.141592653589793238462643383279), in order.

The poem’s text:

Sir, - I send a rhyme excelling
 3     1   4  1   5       9
In sacred truth and rigid spelling.
 2    6     5    3    5      8
Numerical sprites elucidate
    9        7        9
For me the lexicon's dull weight.
 3  2   3     8       4     6
   If "Nature" gain,
    2    6      4
   Not you complain,
    3   3     8
Tho' Dr. Johnson fulminate.
 3    2     7       9

Most definitely a bit of oulipisme-avant-le-lettre.