The office of Secretary-Treasurer was first held by George F. Downes (1899-1906), then H. G. Clarke (1906-1909), and finally C. E. K. Cox (1910-1912).
This series includes correspondence from the office of the Secretary-Treasurer.
The series is divided into four subseries:
- Subseries 5.1: Letterbook of Outgoing Correspondence (November 1, 1899 -October 6, 1906)
- Subseries 5.2: Letterbook of Outgoing Correspondence (October 8, 1906 -July 17, 1907)
- Subseries 5.3: Correspondence (May 1901 -March 15, 1907)
- Subseries 5.4: Correspondence (March 15, 1907 -March 1912)
Subseries 5.4 also includes two photographs of Sollitt House and Yard: EA-10-2739 and EA-10-2740.