586 EEPORTS OF EUROPEAN OBSERVATORIES. 



Publications of the Observatory. 



1. Notices on observations of the new star in the Swan, by Dr. Vogel. 



2. Report on the Transit of Mercury. 



3. Observations on the sun-spots from October, 1871, to December, 

 1S73, by Professor Sporer. 



4. Observations and researches on the physical condition of Jupiter, 

 and observations on Mars, by Dr. Lohse. 



5. On the origin of protuberances by chemical processes, by Professor 

 Sporer. 



0. Dr. Vogel's report on the observations of the solar spectrum is in 

 press. 



7. The star-group •/ Persei, observed in the years 1SG7-1870 with the 

 8-inch refractor of the Leipzig Observatory, by Dr. Vogel. 



UNIVERSITY OBSERVATORY, STOCKHOLM. 

 (Dr. HUGO Gvldex, Director.) 



The work of the observatory has quite unexpectedly been interrupted 

 by the sickness of the director and by the resignation of the assistants. 

 At present the personnel is again complete, Mr. 0. A. Lindhagen being 

 hrst and Mr. II. Branting second assistant, with Mr. Rankin, of Hel- 

 singfors, assisting temporarily. 



Examination was made of the error in the division of the meridian 

 circle, mainly performed by Mr. Jiiderin, and to be described by him in 

 a special report. 



The observations commenced in 1877, with the view of determining 

 relative parallaxes by registration of differences of right ascension of 

 stars close together, has to be delayed on account of the sickness of the 

 director. The observations made thus far refer to the following stars: 

 a Cassiopeia}. Z Herculis. 



// Cassiopeia^. P Lyrse. 



/3 Andromedoe. . v Lyrse. 



# Persei. e Cygni. 



c Persei. 01 Cygni. 



a Persei. C Cygni. 



a Aurigse. r Cygni. 



No. 01 of Argelnnder's Catalogue. No. 240 of Argelander's Catalogue. 

 $ Aurigai. t Andromeda 1 . 



UNIVERSITY OBSERVATORY, STRASSBURG. 



(Prof. A. "Wixnixke, Director.) 



One hundred and seventy-eight observations on 1 18 nebula) were made 

 in 41 nights. A very considerable periodic variability of brightness was 

 recognized in the nebula /( 882 = H I. 20, and is very probable in nebula 

 h 1001 = H IV, 50. 



