REPORTS OF ASTRONOMICAL OBSERVATORIES. (171 



spots in tlie yoarl87() to bo ainaxiinuiii and ill 1878 a niiniimun. It will 

 be noted that these years are nearly those of maxinnini and miniinnui 

 observed auroras. 



Willia:mstown, MaH^acMsetts. 



^YiUi((lthst()^cn Observatory. 



Longitude from Washington, 15'" ]8«.G E. 

 Latitude, 42^ 42' 49" N." 

 Director : ? 



Ypsilanti, Washtenaw County^ Michiyan. 



State Normal School Observatory. 



Longitude from Washington, 20"' 10'' W. , 



Latitude, 42° 13' K 



Authority for latitude and longitude: J. C. Watson. 

 Director : Lewis McLouth, j\I. A. 



Instruments : 



(b) Meridian transit instrument : nialver, GURLEY, Albany 5 aperture 

 IJ inches; magnifying power, 30 diameters. 



((') Equatorial instrument : maker, A. Clark, Cand)ridgeport, Mass.; 

 aperture of objective, 4 inches ; magnifying powers of eye pieces, 45, 00, 

 144, 210. 



{(1) Sjiccfroseojye : Browning, London, 2 prism. 



{h) Chronometer : sidereal; maker, Negus. 



[i] Miscellaneous: The observatory building is completed. Xo syste- 

 matic work has been done. The building is small, and its equipment is 

 for instruction rather than investigation. The equatorial is quite good 

 — the one with which Professor Watson made his observations on the 

 supposed planet Vulcan. 



IL FOREIGN OBSERVxVTORIES. 



Aberdeen, Scotland. 



See Dun Echt. 



Abo, Russia. 



Abo Observatory. 



Longitude from Greenwich, 1'' 29°' 8».2 E. 

 Latitude, GOO 20' SC'.SK 

 Director : ? 



