Surgeon General’s Office, June 29, 1872
Surg. B.J.D. Irwin, U.S. Army
Dear Doctor: Some months since you sent to the Museum some valuable specimens from an interesting case of cystic kidney (Prv. Jas. King, Co “I” 6th Cav.). The non-cystic kidney in this case contained astride the apex of one of the pyramids what is described in the accompanying history of the case as a “metallic ring.”
I thought it would be of interest to you to learn that this ring proved on investigation to be a small renal calculus of unusual shape. On the analysis of a portion, it proved to be comprised chiefly of the fusible triple phosphates with some dark pigment and a little uric acid.
Very respectfully,
Your obdt Srvt,
(Sgd) J.J. Woodward,
Asst Surgeon, USA