A letter from Whitehead's father congratulating him on his book, Treatise on Universal Algebra. Whitehead's father died the following month, so this is likely the last letter ANW got from him.
Fokker sends Whitehead an article he had written for a Dutch journal; asks that he send a copy of Principle of Relativity to the "Physica" journal for review purposes.
Heath inquires whether Whitehead would be interested in publishing a book with Open Court, also wonders if he would be interested in delivering the Carus lectures.