the summation, reduction, and discussion of the results of other observers with whom he corresponded in all parts of the world. With Robert P. Greg he formed extensive catalogues of the radiant points of meteor streams, the more important of these being published in the Reports of the British Association for 1868, 1872, and 1874. A table of the radiant points of comets computed by Herschel alone is in the Report for 1875. He was reporter to the committee of the British Association on the 'observations of luminous meteors,' and from 1862 to 1881 drew up annually complete reports of the large meteors observed, and of the progress of meteoric science. For the British Association (1874–81) he prepared reports of a committee, consisting of himself, his colleague at Newcastle, George A. Lebour, and John T. Dunn, which was formed to determine the thermal conductivities of certain rocks. For the Monthly Notices of the Royal Astronomical Society, he prepared the annual reports on meteoric astronomy each February from 1872 to 1880 and contributed many other important papers to the Notices. In a June 1872 paper, he showed the connection between meteors (the Andromedids) and comets (Biela's Comet), and he predicted the shower which recurred on 27 November of that year. Herschel acquired great precision in noting the paths of meteors among the stars. From his determination of the radiant point of the November Leonids, Giovanni Schiaparelli deduced the identity of their orbit with that of Tempel's Comet of 1866, 55P/Tempel–Tuttle. In 1864 and 1873 he observed the bright green colour of two respective Geminid meteors. Besides meteoric astronomy, Herschel was interested in many branches of physical science, and became a member of the Physical Society of London in 1889 and of the Society of Arts in 1892. He contributed frequently to Nature, an article on "The Matter of Space" in 1883 being specially noteworthy. He worked much at photography, and in 1893 the Amateur Photographic Association presented an enlarged carbon print portrait of Alexander Herschel to the South Kensington Museum for the British Museum Portrait Gallery. Herschel became fellow of the Royal Astronomical Society in 1867, and on 12 June 1884 was elected Fellow of the Royal Society, an honour already conferred on his grandfather, his father, and his younger brother John. In 1886, he gave up his professorship, and was made Doctor of Civil Law of Durham University. In 1888,