Any additions to the list below will be very useful:
Montague John Druitt
A Timetable of His Death
Wednesday 19 September 1888 - Druitt appears for the defence in the case of Christopher Power, charged with malicious wounding (Central Criminal Court)
The committal hearing for Power was held at Marylebone on Saturday 11 August
Towards end of October 1888 - Druitt stays with his brother William in Bournemouth for one night (exact date unknown)
Tuesday 27 November - Druitt appears for the appellants in the case Hake v Gosling in the Court of Appeal. On Friday 30 November it was reported that the appellants were successful
Friday 30 November 1888 - Druitt is dismissed from the school at 9 Eliot Place
Tuesday 11 December 1888 - William Druitt is informed by a friend (identity unknown) that MJD had not been heard of at his chambers (King's Bench Walk) for more than a week (i.e. some time prior to 4 December)
After 11 December 1888 - William Druitt goes to London. At Blackheath he learns that Druitt had got into "serious trouble" and had been dismissed from Valentine's school on 30 November 1888
William Druitt has MJD's effects searched "where he resided" (King's Bench Walk) and the suicide note was found
Saturday 22 December - The ball at Canford Manor, Wimborne, on the guest list for which Druitt's name is included
Monday 31 December 1888 just after 12:00 - Druitt's body found in the Thames off Thorneycroft's Works, Chiswick, by Henry Winslade.
Montague John Druitt
A Timetable of His Death
Wednesday 19 September 1888 - Druitt appears for the defence in the case of Christopher Power, charged with malicious wounding (Central Criminal Court)
The committal hearing for Power was held at Marylebone on Saturday 11 August
Towards end of October 1888 - Druitt stays with his brother William in Bournemouth for one night (exact date unknown)
Tuesday 27 November - Druitt appears for the appellants in the case Hake v Gosling in the Court of Appeal. On Friday 30 November it was reported that the appellants were successful
Friday 30 November 1888 - Druitt is dismissed from the school at 9 Eliot Place
Tuesday 11 December 1888 - William Druitt is informed by a friend (identity unknown) that MJD had not been heard of at his chambers (King's Bench Walk) for more than a week (i.e. some time prior to 4 December)
After 11 December 1888 - William Druitt goes to London. At Blackheath he learns that Druitt had got into "serious trouble" and had been dismissed from Valentine's school on 30 November 1888
William Druitt has MJD's effects searched "where he resided" (King's Bench Walk) and the suicide note was found
Saturday 22 December - The ball at Canford Manor, Wimborne, on the guest list for which Druitt's name is included
Monday 31 December 1888 just after 12:00 - Druitt's body found in the Thames off Thorneycroft's Works, Chiswick, by Henry Winslade.

I think Druitt would have been allowed to remain in his chambers for the weekend at least. I am aware of the current practice of escorting a dismissed employee from the premises but I doubt that kind of spectacle would have taken place in 1888. I think George Valentine would have said something like, "See here, Montague, Michaelmas term is just now ended. I will give you [X number of] days to clear your things out of the school. Here is your final pay and an additional severance settlement." Montague disappears the next day. As the school was not in session (and quite possibly Valentine may have been away on holidays) there would be no point in removing Montague's things. Also, another news story mentions a letter addressed to Valentine. I believe this is a confusion and the letter spoken of there is the same "Since Friday" letter that we are talking about. The fact that is was believed to be addressed to Valentine supports the notion that it was found at the school.
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