This fonds consists of appointment diaries in which Dr. Hugh B. Hay recorded his patients' names, the reasons for their calls, and the amount to be charged for services. There are volumes for 1914 and 1931-1941. It is unclear who continued to make entries in the volumes for 1940 and 1941 after Dr. Hay's death. Possibly, they were used by a family member or by the individual who was responsible for settling Hay's business affairs. A number of entries in the 1941 appointment diary deal with payment of bills, accounts, rent, mortgages, and notes, and other business transactions.

A receipt for goods purchased by Dr. Hay from M. Kane, a statement of account owing to H. B. Hay from [William] Brock, and a promissory note for $30.00 signed by Gordon and Arthur Miller in favour of H. B. Hay are also included.