"(Germ.) Weimar. Grandma tea-drinking. 8 x 10. It is merely necessary that these life-like studies are by the same hand which painted 'lunch time in school,' no. 14 of this catalogue." (see serial 04120177 for the other study mentioned, and serial 04120014 for the other picture by piltz)
A Catalogue of Paintings in the Gallery of D.W. Powers, Rochester, N.Y. with Explanations and Sketches of Painters by C.C. Merriman. Rochester, N.Y.: E.R. Andrews, Book and Job Printer, Aqueduct Street, 1877.