“Physical, Observational, and Instrumental. The slides are selected and arranged by the Rev. Philip Sleeman, F.R.A.S., F.R M.S., &c. The series is specially adapted to meet the requirements of public lecturers and teachers of science. Under Part I, 'The Sun' (75 slides), the relative sizes of the sun and planets, sun spots, the solar spectrum, solar eclipses, solar prominences, are the chief items dealt with. Under Part II., ' The Solar System ' (115 slides), the Ptolemaic and other systems, the comparative sizes of planets, the seasons, the tides, sidereal and solar day, eight moon views, and views of Mars, Jubiter and Saturn, are the chief. Under Part III, 'The Sidereal System ' (70 slides) we have the constellations, star spectra, comets, and fourteen ancient cosmographies. And under Part IV., ' Astronomical Instruments ' (40 slides), we have three equatorial telescopes, an alt-azimuth, reflecting telescopes, transit instruments, micrometers, the sextant, and various observatories.”