Offers AD a puzzle and JH's solution to AD's problem about a body revolving in the evolute of an ellipse. On sending Francis Baily's correspondence to Greenwich.

Thanks JH for discovering an important error in a work WS asked him to proof read. Asks JH about a variable in Canis Minor over which there is some debate.

Thanks for having sent various publications; believes that the Academy's intention has been to send JH complete series; states which issues JH has not received.

Writes to arrange a visit to Collingwood.

Has been absent from home, which accounts for his belated reply. Comments on JH's difficulties in relation to W. H. Hopkins's memoir on the external temperature of the earth. JH's son is progressing well.

JH has got hold of the explanation about central forces. Need not worry about Elizabeth Baily; he will see to that. Do not reject any letters; they may be important in the future. Gives one of his own theorems.

Has received the agreement noted on his ticket of 14 Feb.