(a) Dickson's History of the Theory of Numbers, Vol II,
page 756, lines -5 to -1, and page 757, lines 1 to 4:
Some related work of E. Wendt is described.
(b) Idem (a), but page 757, lines 14 to 24:
Some related work of G. B. Mathews (in 1895) is described.
(c) Mathews ' work cited in (b) appears (in French)
in page 132, lines 1 to 13 of R Nogues, Theoreme de Fermat
Son Histoire, reprint (1992) Jacques Gabay's edition of the original of 1932.
All this is related to "the first case" of Fermat's Theorem
as worked by mathematicians at the end of 19th century.