But Why Turkish?

Both Holmes and I had a weakness for the Turkish bath. It was over a smoke in the pleasant lassitude of the drying-room that I have found him less reticent and more human than anywhere else. On the upper floor of the Northumberland Avenue establishment there is an isolated corner where two couches lie side by side...

- The Illustrious Client (1924)

“But why Turkish?” asked Mr. Sherlock Holmes. [...] "Why the relaxing and expensive Turkish rather than the invigorating home-made article?”

- Lady Frances Carfax (1911)

There are good reasons.