Tells GA about a new comet becoming visible.

JH's account of a comet reminds WT of a strange sighting many years ago. Comments further on improvements in photography, both those made and those needed.

Sends deeds already signed by J. J. Guest. JH should sign and return them. [Annotation by unknown hand: Mrs. Hollier's marriage and settlement.]

Describes observing of comet that evening.

More on confused systems of star magnitudes used by Thomas Henderson.

Suggests 'amphitype' as name for JH's process whereby same picture can go from negative to positive. Further comments on comet sighting, and on some improvements to Daguerreotype.

Comments on JH's positive calotype. Suggests comet may be return of (J.-D.) Cassini's comet of 1668. Gives theorem for finding parabolic orbit of comet if two observations are made in the ecliptic.

Announces election of Marquis of Breadalbane [John Campbell] as lord rector of Marischal College for coming year. Thanks for JH's advice to college senate.

WD's 1843 measurements for Gamma Virginis. Used crystal micrometer for all observations, to compare with parallel wire micrometer used in past.

Suggests modifying square base of JH's telescope to round base. Estimates cost at £80 to £100.

Refuses to risk GD's funds by giving cost estimate for unusual telescope, especially if R.S.L. expects GD to pay for any expenses over estimate. Regretfully stops manufacture of telescope.

The committee report on simultaneous magnetical and meteorological observations will be read at the B.A.A.S. meeting in Cork on 17 Aug.

Extract from observations of 70 Ophiuchi by F. W. Bessel. Results agree with WS's measurements by different method and increase WS's confidence. Hopes for more information on Gamma Virginis before finalizing WS's manuscript.

JH's theory of orbits of Castor and Gamma Virginis. Observations of Gamma Virginis by W. R. Dawes and by WS.

Problems with computation of Gamma Virginis.

Will send JH's report to JH in August. J. C. Ross will not be at Cork meeting, but JH may announce there that first year of Ross's observations at sea will appear in R.S.P.T.

Agenda items for next meeting of 'Committee for Superintending the Construction of Standards.' Compares English, French, Danish, and Prussian standards.

Commissioners of Treasury invite JH to join committee to oversee construction of 'New Parliamentary Standards of Weight and Measure.'

Thanks JH for his letters about the Cape equatorial instrument.

Inquires of CL about the suitability of George Robert Waterhouse for a natural history post in the British Museum. Congratulates CL on his successful trip to the United States.