236 Proceedings of the Royal Society of Edinburgh. [Sess. 
(y) The maximum of curve I being thus fixed at between 93f° and 97 J°, 
the left-hand side of the curve is drawn from the observations and the 
right-hand side from symmetry. Curve II is then drawn again, and the 
curves are adjusted to fit in as well as possible with the observations. In 
each case the form of the curves has been derived for curve I from the left- 
hand side and for curve II from the right-hand side. 
The results are as follows : — 
A. Poles. Stream I in direction 93f° or 6 h 15 m , with a maximum of 
23 \ ; Stream II in direction 262 J°, or I7 h 30 m , with a maximum of 5. 
