Roval Dublin Society. 
aN OW a a 
FOUNDED, A.D. 1731. INCORPORATED, 1749. 
EVENING SCIENTIFIC MEETINGS. 
Tur Scientific Meetings of the Society are held alternately at 4.30 
p.m. and 8 p.m. on the third Tuesday of every month of the Session 
(November to June). 
Authors desiring to read Papers before the Society are requested 
to forward their Communications to the Registrar of the Royal Dublin 
Society at least ten days prior to each Meeting, as no Paper can be 
set down for reading until examined and approved by the Science 
Committee. 
The copyright of Papers read becomes the property of the Society, 
and such as are considered suitable for the purpose will be printed with 
the least possible delay. Authors are requested to hand in their MS. and 
necessary Illustrations in a complete form, and ready for transmission to 
the Editor. 
DUBLIN: PRINTED AT THE UNIVERSITY PRESS BY PONSONBY AND GIBBS. _ 
