PHILOSOPHICAL SOCIETY OP WASHINGTON. 21 



Ferguson, finds that the explanation given by Prof. Peters is 

 undoubtedly correct. These books show that Mr. Ferguson 

 made eleven comparisons of the difference of declination, and 

 that eight of these comparisons were correct, and three erroneous. 

 For some unknown reason Mr. Ferguson in his reductions changed 

 the eight correct comparisons to correspond with the three erro- 

 neous ones, and this arbitrary change produced the mysterious 

 pseudo-planet. 



15 2d Meeting. December 21, ISTS. 



The President in the Chair. 

 Mr. W. H. Dall continued his communication on 



THE MUSEUMS AND ZOOLOGICAL GARDENS OP NORTHERN EUROPE, 



describing those at Bremen, Berlin, Gotha, Frankfort-am-Main, 

 Stuttgart, Bonn, Cologne, Amsterdam, and Paris; also those of 

 London, Oxford, Cambridge (Eng.), Edinborough, Dublin, and 

 Liverpool : also answering inquiries made by Messrs. Newcomb, 

 Powell, Elliott, and Harkness. 



Mr. J. W. Osborne made a communication on 



suggestions respecting the study of meteorology in regard 

 to the causes op yellow fever. 



Remarks were made by Mr. Antisell. 



153d Meeting. January 4, 18t9. 



The President in the Chair. 

 Twenty-three members and visitors present. 

 Mr. A. N. Skinner communicated 



A NOTE ON the precession OP STARS IN RIGHT-ASCENSION. 



Remarks were made by Mr. Newcomb. 

 41 



