CONTENTS. 
Page, 
NOTICES OF LECTURES DELIVERED AT THE EVENING 
MEETINGS OF THE ASSOCIATION. 
Professor Powell— The Rev. VV. Whewell— Professor Babbage— 
Professor Sedgwick— -Dr. Lardner— Dr. Barry— Professor Wheat¬ 
stone. 5 
NOTICES AND ABSTRACTS OF MISCELLANEOUS 
COMMUNICATIONS TO THE SECTIONS. 
MATHEMATICS AND PHYSICS. 
Mr. M’Cullagh’s short Account of some recent Investigations concern¬ 
ing the Laws of Reflexion and Refraction at the surface of Crystals. 
Professor Powell on certain Points connected with the recent Disco¬ 
veries relative to Radiant Heat... 
Dr. Henry Hudson on the Phenomena usually referred to the Radia¬ 
tion of Heat... 
Professor Wheatstone on the Prismatic Decomposition of Electrical 
Light. 
The Rev. James Challis on the simultaneous Vibrations of a Cylindrical 
Tube and the Column of Air contained in it. 
Dr. Robert Kane’s Case of Interference of Sound. 
Professor Wheatstone on the various Attempts which have been made 
to imitate Human Speech by Mechanical Means. 
Dr. D. B. Reid on the Construction of Public Buildings in reference to 
the communication of sound. 
Mr. J. S. Russell’s Experimental Researches into the Laws of the 
Motion of Floating Bodies.... 
Mr. W. Snow FIarris on a Species of Balance and its Application to 
the Measurement of Electrical Repulsion. 
Mr. W. Snow Harris on Electrical Attraction. 
Mr. W. Snow Harris on the Application of the Proof Plane and Tor¬ 
sion Balance to inquiries in Electricity. 
Sir John Ross on the Aurora Borealis... 
Mr. R. Mallet on an ceconomic Application of Electro-magnetic 
Forces to manufacturing Purposes.. 
a 2 
9 
9 
11 
12 
13 
14 
14 
16 
17 
17 
18 
18 
18 
© 
