Section 239: Refreshing memory.

1 A witness may, while under examination, refresh his memory by referring to any writing made by himself at the time of the transaction concerning which he is questioned, or so soon afterwards that the court considers it likely that the transaction was at that time fresh in his memory.

2 The witness may also refer to any such writing made by any other person, and read by the witness within the time mentioned in subsection (1) of this section, if when he read it he knew it to be correct.

3 An expert may refresh his memory by reference to professional treaties.