REPORTS OF EUROPEAN OBSERVATORIES. 589 



2. Meteorological; the observations are being published monthly in 

 the "Annalen der Hydrographie." 



3. Physical, the registering of magnetic and tidal observations ; and 

 4.' Nautical, comprising the examination of chronometers and barom- 

 eters, and tbe determination of the compass deviation on shipboard. 



Tides have been observed at various places and the observations dis- 

 cussed. Only one series, the one of Wilhelmshaven, has been printed 

 in the Annales ; but as a result of the observations tidal tables for the 

 Baltic Sea have been published by the hydrographie bureau of the im- 

 perial navy. 



Time signals were received from the Berlin Observatory during the 

 earlier stages of its time-ball service. 



Observations with the meridian circle were made on the Moon and 

 such objects as are connected with it, including Uranus and Neptune. 



The meteorological observations have been continued uninterruptedly. 



Observations are being made on declination, inclination, and intensity 

 of the terrestrial magnetism. 



The personnel of the institute has been increased by the appointment, 

 as assistant, of Dr. Andries. 



UNIVERSITY OBSERVATORY, ZURICH. 

 (Dr. Rudolf Wolf, Director. 



Observations on frequency of sun-spots were made whenever practi- 

 cable, and the notes on sun-spot literature continued in the "Astronom- 

 ische Mittheilungen." For determination of position of the spots, ob- 

 servations could be taken only on sixteen days, and were conducted by 

 Mr. Alfred Wolfer. 



Comparisons of Mairet's clock (standard) for sidereal time were made 

 by Mr. Wolfer, who also recorded a number of observations with the 

 equatorial and micrometric measurements, made 2 drawings of Venus, 

 52 of Jupiter, 18 of Saturn, and observed the transit of Mercury. 



