Proof reading of his book, [Man's place in the Universe] sending the last four chapters; agrees section on the sun vague, argument on light of stars cut out; gravitation and angular velocity of forces at earth's centre; Mr Marshall to read proofs also, asks William Greenell Wallace to compare readings with him; writing rushed but can be improved in a new edition. The last page is annotated in pencil [in William Greenell Wallace's hand] with mathematical calculations.