Great George Street, Westminster, is the address of Doyle and Broadbent, civil engineers. On the threshold one reads that the firm consists of Mr Lawrence Doyle and Mr Thomas Broadbent, and that their rooms are on the first floor. Most of their rooms are private; for the partners, being bachelors and bosom friends, live there; and the door marked Private, next the clerks' office, is their domestic sitting room as well as their reception room for clients. Let me describe it briefly from the point of view of a sparrow on the window sill.