Vol. VIII. 





Plate XXIII. 



Royal Physical ScciAiy I.'dz7if)uryh. 







ill ^1 -v 





^q,:mmm 



,3 ^^ 



11 ^^.r/^pP^VA; 



Fi^. 1. 



^--% 







Fi^- 2 



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M?^^ ' '■~''^^^'^ ^T'*:?^?' 



pi 



A <f^..^.-r^^~.. 



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i?-..'^. 





K'Fa.rlane (5c Ers]<in«, Lith'f EJi 



