478 



Scientific Proceedings, Royal Dublin Society. 



^ 



P5 



.1^ 



■yd g o 



(D C3 r1 

 <^ 5-^ B^ 



^1 i 



o g CD 



.2 ^ 



r^ .5 



'^i Tf< lr~ O 



CD CO CO »0 



C<1 CM (M !M 



o CO o o 



lOOCDlOiO-^OOCOOr^OOO 



cococococococavocDiCivoco 



C50<M(M(MC^(M<N<MC<)cqM 



oooooooooooo 



CO O ■* lO 





