371 
of Edinburgh, Session 1873-74. 
ments show that this is approximately the case — deviations of 10° 
from parallelism being rare, even when, as is often the case, the 
three canals of one ear are not at right angles to one another. 
The methods employed in making these measurements were 
explained and illustrated. 
[ Note by the Author . — Since presenting to the Society, on January 
19th, the Preliminary Note on the Sense of Rotation and the 
Function of the Semicircular Canals of the Internal Ear, I have seen 
abstracts of papers on the same subject by Professor Mach and by 
Dr Breuer. As far as I can judge from these abstracts, while Pro- 
fessor Mach and Dr Breuer refer the action of rotation upon the 
ampullary nerves to the inertia of the contents of the canals, they 
do not seem to have noticed the parallelism of the plane of the 
superior canal of the one ear to that of the posterior canal of the 
other, nor to have observed that approximate parallelism of these 
planes is essential, if the semicircular canals are the peripheral 
organs of the sense of rotation.] 
The following Gentlemen were admitted Fellows of the 
Society : — 
R. H. Traquair, M.D., Mus. Science and Art. 
Francis Jones, Esq., Lecturer on Chemistry, Manchester. 
W. F. Barrett, F.O.S., R. College of Science, Dublin. 
Monday, 20 th April 1874. 
Sir WILLIAM THOMSON, President, in the Chair. 
The following Commnnications were read : — 
1. On Last-Place Errors in Vlacq’s Table of Logarithms. 
By Edward Sang, Esq. 
Now fifty years ago, while engaged with some heavy calculations 
connected with engineering work, I became impressed with the 
advantage of having logarithmic tables much more extensive than 
those in use. The trouble of the interpolations at the early part 
of the table, contrasted with the convenience of the small addi- 
3 B 
VOL. VIII. 
