Our plan for today was to see the Arab World Museum. However, we didn't leave the house until nearly noon. After a brief look at the Paris mosque, we realized that if we were going to eat lunch we had to do so soon because it can be difficult to find a meal between 2:00 p.m. and 7:00 p.m. This has caused problems in the past.
We were near Rue Mouffetard, a market street, and found a restaurant there where I got veal in a cream sauce and the co-diner had fish. Dessert, as shown in the photo, was tarte tatin (a caramelized apple tart) and cherry tart. After some exploration (and cheese shopping) on Rue Mouffetard, we realized that it was really to late to do a museum, so the Institute of the Arab World will have to wait until later in our trip.
Instead we went to St. Etienne-du-Mont, which has a mixture of architectural styles and the oldest organ in Paris. Someone was playing it while we were there. It also contains the tomb of St. Genivieve and some of her relics.