He hit the accelerator and froggered into the fast lane, inciting a symphony of angry honking.

To make it a bit easier to follow, each added letter is underlined, and insertions/hydrations/ caudations are parenthesized.

The same evening John Rossitter wrote to the Bishop of Nawaub, and very humbly and diffidently offered himself, his young life, his health and his strength, his talents and energies, his younger son's portion, all that God had given him, for his Master's use;

The cougher makes a lunge. Slothrop sweeps aside, gives him a quick veronica with his cape, sticks his foot out and trips the kid, who lies on the ground cursing