18 
Royal Irish Academy, 
Papers published in the Proceedings : — 
" A Note on Some New Properties of Surfaces of the Second Order." 
" On the EquiHbrium or Motion of a Molecular System." 
On the Properties of Inextensible Surfaces." 
On the Effect of the Internal Fluidity of the Earth on the Length of the 
Day." 
" On the Reflexion and Refraction of Polarized Light." 
*' On a New Analysing Prism." 
** On a New Optical Saccharometer." 
" On a Fluid possessing Opposite Rotatory Powers for Rays at Opposite 
Ends of the Spectrum." 
"On an Optical Method, by means of which the Formation of Definite 
Chemical Compounds may be in certain cases Determined." 
' ' On Optical Saccharometry, with special reference to an Examination of 
some Specimens of Sugar Beet grown in Ireland." 
" A further Communication on Optical Saccharometry, with special refe- 
rence to the Sugar Beets grown in Ireland in the year 1872." 
" On the question of Chemical Equilibrium." 
* ' On the Chemical Changes which take place in the Potato during the Pro- 
gress of the Disease." 
The Eeport was adopted. 
On the motion of the Secretary of the Academy, seconded by Dr. 
J. T. Banks, By-Law 6 of Chapter IX. was suspended (for the pur- 
pose of the reading of Papers and the admission of Visitors). 
Professor Cunningham, m.d., read a Paper On the Growth of the 
Brain during Childhood and Adolescence ; with some Observations 
upon Cranio-cerebral Topography. Illustrated by a Series of Models 
of the Human Brain in situ'^ 
By permission of the Academy, Professor Alexander read a Paper 
by Mr. A. W. Thomson and himself ''On Two-nosed Catenaries, 
and their Application to the Design of Segmental Arches." 
The following letter was read : — 
" Peovost's House, 
" 2nd March, 1888. 
" Deae De. Weight, 
" I write on behalf of my mother and myself to return our 
sincere thanks to the Eoyal Irish Academy for the kind resolution 
passed by them on the 27th ult. Kind and generous as the resolution 
is, it is doubly valuable and comforting to us when coming from the 
