The letter was written on the day the Rev. Salles was to go to Saint-Rémy
(l. 16); we know from a letter written by Dr Peyron to Theo on 29 April that this visit took place the day before (FR b1059). On the basis of this we have dated the present letter to Sunday, 28 April 1889. The fact that Jo van Gogh-Bonger dated it to 29 April (
Brieven1914) could have to do with the postmark, in which case the letter was sent a day later.