Helen Maria Williams's Peru: A poem in Six Cantos (1784).
Williams 1761-1827
Daughter of a Welsh Army officer, Charles Williams and a Scottish Mother, Helen Hay Williams.
Williams best known for her contributions to reform writing as an eyewitness of the French Revolution (England both feared and admired the French Revolution--the aristocracy jealously guarded their privileges, while the working poor clamored for better living conditions.). She grew up on the border between England and Scotland in Berwick.
Intellecutal inheritance includes Dissenter ideology and the Enlightenment.
Participated in Salon and Coterie culture in England, where she was able to circulate with other artists, writers, and thinkers.
Samuel Rogers, a banker-poet, called her "a very fascinating person, though not handsome. . .with much conversational power" (Kelly, 30)

Patrons include Elizabeth Montagu, to whom she dedicates Peru.
Andrew Kippis, a scholar and advocate of social reform
Important works include:
An Ode on the Peace (1783 celebrates the end of the American war as an end to domestic grief)
Edwin and Eltruda: A Legendary Tale (1782 anti war poem that surveys the sorrows of a young woman caught up in an armed conflict)
Peru (1784)
On the Bill for Regulating the Slave Trade (1788)
Julia, A novel (1790)
Letters Written in France, in the Summer of 1790, to a Friend in England; Containing various Anecdotes Relative to the French Revolution; and Memoirs of Mons. and Madame du F-- (Du Fosse  1791)
Letters From France: Containing a Great Variety of Interesting and Original Information Concerning the Most Important Events that Have Lately Happened

Typography
A note on the text:
Like her 18th-century counterparts, Helen Maria Williams used the long "s." At a glance, the long "s" looks like "f"; but examine the letter closely and you'll see something different.
You need to make a mental translation in order for the poem to make sense.  For example, the text reads:
t r a n f i e n t   f p a r k   o f   G e n i u s   f i r e
You need to "translate" this phrase as:
t r a n s i e n t   s p a r k   o f   G e n i u s   f i r e

As you can see, the long "s" is used in the middle and the beginning of words, but not at the end of "Genius."

Further examples of the long s and the Regular s
The Upper-case Regular S is used at the beginning of words:
ex. Season
The lower-case regular s is used at the end of words
Seasons
The long s (f) is used at the end of words:
Seafonf (Seasons)
The long s (f) is used in the middle of words
Seafon (Season)
effufion (effusion)
The long s (f) is used at the beginning of words
fharp (sharp)
fhroud (shroud)