The hydro-electric methods in medicine : with chapters on current from the main, cure-gymnastics, etc / by W.A. Hedley. https://www.rawpixel.com/image/14012361/image-person-medicine-living-roomFree Image from public domain licenseHydrotherapy: eight vignettes of different cures at Gräfenberg, Germany. Lithograph, ca. 1860. https://www.rawpixel.com/image/13971171/image-dogs-cartoon-faceFree Image from public domain license