In 1891, Millet was concerned about the direction that contemporary art was moving and he wrote an opinion article entitled What are we doing in Art? the following Wikipedia entry on Art in 1891 provides some context for Millet’s thoughts, in terms of events and artwork being introduced for the first time and other art events in 1891.
Link to 1891 in art: https://en.wikipedia.org/wiki/1891_in_art
Link to NYC public library original Millet manuscript of What are we doing in Art?: https://digitalcollections.nypl.org/items/b12d8a90-aeec-0136-1f4e-31d74861e815
Manuscripts and Archives Division, The New York Public Library. “Millet, Francis Davis – What are we Doing in Art” The New York Public Library Digital Collections. 1870 – 1900.