485 
of Edinburgh, Session 1868-69. 
Constructio to the discussion of the doctrine of limits (de accura- 
tione); that his logarithms were denounced by the metaphysicians 
of his day as founded on the false system of approximation, but 
that, fortunately for the progress of exact science, their objections 
were unheeded. 
Sir W. Thomson said, that the metaphysicians, wishing to find 
the speed of a vessel at 12 o’clock from an hour’s run, would choose 
the hour from 12 to 1 ; whereas Napier, Newton, and the rest of 
the world, would take it from 11-30 to 12-30. 
3. Note on Captain A. MoncriefFs system of working 
Artillery. By It. W. Thomson, Esq., C.E. A Model of 
Captain MoncriefFs Gun Carriage was exhibited, and its 
mode of action was shown. 
4. Note on an undescribed variety of Flexible Sandstone. 
By T. C. Archer, Esq. 
The following gentleman was admitted a Fellow of the 
Society : — 
Dr R. Craig Maclagan, F.R.C.P.E. 
it 
VOL. VI. 
