From the National Archives, RG 109, Ch. 6, Vol. 707-709; "Letters Received and Sent, Chimborazo Hospital. 1861-64." 3 Vols: Vol. 708, p. 73
Med. Dir. Office, Richmond March 20th/63
Surg. McCaw,
Sir,
You are respy requested to state (after consultation with you Division Surgeon) your opinion as to the advisibility of a Surgeon Dentist making visits to your Hospl at Stated times, say 2 times or 3 times weekly for such simple operations on the teeth (principally extraction) as may be required. The services of a Dentist very skillful in Extraction &c can be procured on contract.
Very Respy
Your Obedient Servant
Wm. A. Carrington
Surg & Medl Director
Surg. in charge
Chimborazo Hospl