JPbuL . Trans .MD CCCLXX. Plate IXX' 
Carve shewing Relation of Total CkermaxL Intensity 
to SwLs ALtbxole . Lisbon Aug as b 1867 . 
! 
I 
direct 
oUTfns&oL 
Curves 'shewing Relation of dtreci & dtFfaseoi Chemical Intensity 
to Sum's AUtbtdt — Lisbon August 1867. 
-E -Thcrrpe oLett 
~W.V\Jest a>tp. 
