434 



one of the logarithms of a given quaternion q'^ to a given hase 

 Q/, is found to involve two independent whole numbers n and 

 7i', as in the theories of Graves and Ohm, respecting the ge- 

 neral logarithms of ordinary imaginary quantities to ordinary 

 imaginary bases. 



For other developments and applications of the new 

 theory, it is necessary to refer to the original paper from 

 which this abstract is taken, and which will probably appear 

 in the twenty-first volume of the Transactions of the Aca- 

 demy. 



November 30. (Stated Meeting.) 



REV. H. LLOYD, D. D., Vice-President, in the Chair. 

 The Rev. Dr. Todd, V.P., presented to the Academy, in 

 his name and that of Mr. O'Donovan, a volume containing 

 tracings made from Irish MSS. preserved in the College of 

 St. Isidore at Rome, by the Rev. Dr. Lyons, who had sent 

 them from Rome, some to Mr. O'Donovan, and the re- 

 mainder to Dr. Todd. 



The thanks of the Academy were voted to Mr. O'Donovan 

 and also to the Rev. Dr. Lyons, for the important service 

 he has rendered to Irish literature, by making known the 

 existence of these MSS. 



The Rev. Dr. Todd made some remarks on the progress 

 of the Catalogue, made by Mr. Eugene Curry, of the Irish 

 MSS. in the Library of the Academy. 



The miscellaneous character of the MSS., almost every 

 volume of them containing tracts or poems, wholly uncon- 

 nected with each other, rendered it impossible to attempt 

 any previous classification. Mr. Curry, therefore, took the 

 MSS. in the order in which they stood on the shelves of the 

 Library, hoping that all the important objects of a classiBca- 



