174 IJECOKD OF SCIENCE FOR 1887 AND 1888. 



altazimuth, and of comets with the eijuatorial. The spectroscopic ob- 

 servations for determining tlie motions of stars in the line of sight, the 

 pliotoheliographic record of the sun's surface, the magnetic and meteoro- 

 logical observations, the chronometer and time service are also contin- 

 ued as heretofore. A crown disk for tlie 28-iuch objective, has, after 

 several failures, been obtained by Grubb from Chance & Co., and the 

 Treasury has granted the necessary funds for a 13-iuch photographic 

 telescope to enable the observatory to take its share in the scheme for 

 forming a photographic map of the heavens. Numerous experiments 

 have been made in stellar photography in preparation for this work. 

 An 18-foot dome for a photographic equatorial was built in 1888, and 

 at the same time an addition was made to the space available for com- 

 puting rooms. The annual volume for 1886 has been printed and dis- 

 tributed. We learn that provision has been made for a redetermina- 

 tion of the diflerence of longitude between Greenwich and Paris. The 

 astronomer royal in his last report draws attention to the recently 

 averted danger from a proposed railway tunnel within 840 yards of the 

 observatory. He also points out the inadequacy of the present staft" to 

 handle properly the ever increasing amount of work denjanded from a 

 national observatory, as new helds of research are opened u[) for in- 

 vestigation. 



Grignon. — Sketches of the planets, observations of meteors, meteoro- 

 logical observations, and microscopical studies of cosmicjal dust. Di- 

 rector, Fr. Mayeul Lamey. 



Grimiell. — Iowa College has a small observatory, for instru<;tion, with 

 an 8 inch Clark refractor, mounted in April, 1888, 



Guadalajara {Mexico). — Private observatory of Ingeneiro Carlos F. de 

 Laudero; latitude, + 20^ 40' 31".9; longitude, 6'' 53'" 23^00 west of 

 Greenwich. 



Raiphona [Tonkin). — The longitude of the small observatory as tele- 

 graphically determined by connection with Hong Kong April 5, 6, 7, 



1887, is 7'' 0'" 44:«.04 east of Greenwich. 



Harroiv. — The work of determining the places of comparision stars 

 and other selected small stars has been continued with the meridian 

 circle. Observations of comets have been made with the equatorial. 



Harvard. — Professor Pickering describes the progress of his work 

 under three principal heads : The older instruments of the observatory, 

 the Draper memorial, and the Boyden fund. The 15-inch equatorial has 

 been used upon comets, eclipses of Jupiter satellites, and photometric 

 observations of asteroids. The meridian circle zone catalogue is pass- 

 ing through the press, and some progress has been made in observing 

 the new zone, — 9° 50' to — 14° 10'. The work upon which the meridian 

 photometer has been employed since 1882 was finished September 29, 



1888. The most laborious part of this work was the determination of 

 the brightness of stars- of the ninth magnitude in zones 20 minutes in 

 width at intervals of 5 degrees from the north pole to the declination 



