Digitized content includes fourteen notable illustrations from the publication Röntgen Rays and Electro-Therapeutics, with Chapters of Radium and Phototherapy. Illustrations depict Professor Wilhelm Röntgen, friction spark treatment, the four-celled battery of Schnée, ozone inhalation, treatment by effluvation, x-ray tubes, Moritz orthodiagraphs, x-ray dermatitis, and the Finsen treatment method.

Röntgen Rays was written by Dr. Mihran Krikor Kassabian, one of the early investigators of the medical uses of X-rays, with the intention to present the important facts pertaining to electrotherapeutics and Röntgen rays. The first part of the work addresses magnetism and electricity in general. The second portion of the work is concerned with X-Rays, and the third discusses radium and phototherapy. The work is thoroughly illustrated to depict associated instrumentation and demonstrate its uses.