Mina Loy wrote two pieces on Gertrude Stein. A few decades ago now, I read Gertrude Stein in The Last Lunar Baedeker, a selection of Mina Loy's writings edited by Roger Conover and published by the North American poet and photographer Jonathan Williams' press The Jargon Society, in the UK in 1982. You can find that lengthy piece here.
Now, in Stories and Essays of Mina Loy edited by Sara Crangle, published by Dalkey Archive Press in 2011, there is a shorter piece on Gertrude Stein. Mina and Gertrude met in Florence sometime around 1910 or 1913, and became friends. This piece is Mina Loy's introduction for Gertrude Stein (originally written in French) for a Paris salon run by US expatriate Natalie Barney in 1927.Please click on the images to enlarge them. (The French original follows the English translation). Please excuse the wonky pages.