Time log

The Doctor kept at least two volumes of time logs.

History
The Fourth Doctor hinted he was too busy to still keep track of his travels, indicating that he had written the logs earlier in the present incarnation, or in an earlier one altogether.

He asked Adric to search the logs for references to previous travels to Traken. Adric managed to read the language of the journal, even if he was hindered by the Doctor's handwriting and by the lack of chronological and logical order. The Alzarian expressed frustration with the log by exclaiming, "I read about something that's just happened. The next page says it didn't happen at all!" (TV: The Keeper of Traken)

Behind the scenes

 * In a scene cut from the finished programme, but reinstated for Terrance Dicks's novelisation, Adric turns to the back page of one of the volumes and exclaims there isn't even an index — whereupon the Doctor tells him "Life doesn't have an index, Adric."