Minutes of Proceedings. 
43 
Monday, Januaey 27, 1890. 
Eev. De. Haughton, F.E.S., President, in the Chair. 
Mr. Frederick Purser, m.a., f.t.c.d., and Mr. William S. M'Cay, 
M.A., r.T.c.D., signed the Eoll, and were admitted Members of the 
Academy. 
Donations to the Museum and Library were announced, and thanks 
were voted to the Donors. 
Monday, Febeuaey 10, 1890. 
Eev. De, Hafghton, f.e.s., President, in the Chair. 
Mr. Blayney Eeynell Townley Balfour, d.l., and Eev. Edmund 
Hogan, S.J., were elected Members of the Academy. 
Sir Eobert Ball read his " Mnth Memoir on the Theory of Screws, 
showing a remarkable transformation of the general differential 
equations of Motion and other applications in the theory of Abstract 
Dynamics. 
Professor Haddon read a Paper by Mr. W. Kitchen Parker, r.E.s, 
On the Osteology of the Alcidce and the Anatid(B. 
Donations were announced, and thanks were voted to the Donors. 
Wednesday, Pebeuaey 12, 1890. 
(Special Meeting.) 
A Special Meeting of the Academy was held for the purpose of 
receiving His Excellency the Lord Lieutenant, "Visitor of the 
Academy, 
Their Excellencies the Lord Lieutenant and the Countess of 
Zetland, having been received by the Eev. Dr. Haughton, President, 
and the Members of the Council, were conducted to the Library, 
