IV CONTENTS. 



Page 

 Comparative geographical notices of the more remarkable Plants 

 which characterize Scotland and Ireland. By J. T. Mackat, 

 M.R.I.A,, A.L.S,, &c 257 



Report of the London Sub-Committee of the Medical Section on 

 the Motions and Sounds of the Heart 261 



Second Report of the Dublin Sub-Committee on the Motions and 

 Sounds of the Heart 275 



Report of the Dublin Committee on the Pathology of the Brain 

 and Nervous System 283 



Account of the recent Discussions of Observations of the Tides 

 which have been obtained by means of the grant of Money 

 wliich was placed at the disposal of the Author for that purpose 

 at the last Meeting of the Association. By J. W. Lubbock, Esq. 285 



Observations for determining the refractive Indices for the Standard 

 Rays of the Solar Spectrum in various media. By the Rev. 

 Baden Powell, M.A., F.R.S., Savilian Professor of Geometry 

 in the University of Oxford 288 



Provisional Report on the Communication between the Arteries 

 and Absorbents on the part of the London Committee. By 

 Dr. HoDGKiN 289 



Report of Experiments on Subterranean Temperature, under the 

 direction of a Committee, consisting of Professor Forbes, Mr. 

 W. S. Harris, Professor Powell, Lieut.-Col. Sykes, and Pro- 

 fessor Phillips, (Reporter) 291 



Inquiry into the Validity of a Method recently proposed by George 

 B. Jerrard, Esq., for Transforming and Resolving Equations of 

 Elevated Degrees : undert^dien at the Request of the Association 

 by Professor Sir W. R. Hamilton 295 



