Proc. Roy. Sor, Qd. Vol. I1., Pl. VITI. 
Rawfall fran 1860 lo 1885 represented hy curves of Dyeurs cycte. 
18 
thoel 
Mera? 
ics 
&O Ry 
Hirst Cycve ISCO=O- ae Secona Fycle 1862-72... 
Third Cyde 1878 — 85 - 
