of Edinburgh, Session 1878-79. 
283 
East winds consequently pass over a less extent of surface when 
they are not at rest, because they move in a direction opposite 
to that of progress, and consequently do not require high pressure 
to aid them on their segment. West winds, which have greater 
velocity, and pass over a much greater extent of surface, and in the 
direction of progress, require high pressure on their segment. It 
is in this way that the point is accounted for. Storms do not move 
against high pressure in front, except in those cases in which it is 
far distant. 
6. On the Solution of the Simultaneous Equations : — 
ax + by — c and dx + ey=f \ when the Symbols denote 
Qualities. By Alexander Macfarlane, D.Sc. 
