64 



and the terms in x" , y", z", are all to be taken with positive 

 signs. Sir William Hamilton pretends to no farther merit 

 in the matter than to that of having sought to illustrate, by 

 generalizing in one direction, the foregoing points of the 

 theories of his friends. 



February 10, 1845. 



SIR Wm. R. HAMILTON, LL.D., President, in the 

 Chair. 



Robert Forster, Esq., William Le Fanu, Esq., Reverend 

 George Longfield, John M. Neligan, M. D., William Justin 

 O'DriscoU, Esq., Nicholas P. O'Gorman, Esq., Algernon T. 

 Preston, Esq., and James Emerson Tennant, Esq., M. P., 

 were elected Members of the Academy. 



The President read a paper on Quaternions. — See Appen- 

 dix, No. III. 



A stone celt was presented by the Rev. Dr. Walsh, H.M., 

 from Captain Walsh. 



February 24, 1845. 



SIR Wm. R. HAMILTON, LL.D., President, in the 

 Chair. 



Matthew Baker, Esq., Patrick Joseph Blake, Esq., John 

 D'Arcy, Esq., Rev. Nicholas John Halpin, Samuel Haughton, 

 Esq., F. T. C. D., William Hogan, Esq., C. E., James Mac- 

 donnell, Esq., C. E., Right Hon. David R. Pigot, Matthew 

 R. Sausse, Esq., Walter Sweetman, Esq., R. William Town- 



