Receipt and shipment of various papers and letters. Robert Molyneux has not received payment for clock. JH ordered another for L. A. Fallon; it is ready to ship. Clarifies Edward Sabine's remark about pendulums. Hopes to translate JL's Analytical Geometry. JH translated JL's 'empirical formula of refraction.' Believes JL's method of determining latitude without knowing the time is not new. Notes J. W. A. Pfaff's translation of William Herschel's works.