TRANS. ST. LOUIS ACAD. SCIENXE. 



^ s 



I C r^CO ^1 '1 - CO - 1- CN Cn C^ i^.O -^hO C^V 



' |s "£.£:::-" '^^^ - o \c ^j -r -rco - -t- o £•. : 



+ I 8588 88888 88s88Sl'S888o8888' 8^8888888^ 



oocoooooooocooooooooooooooooooooooo 



. ro - ro O t^vO CO CO - 00 CO J>. r^vO CO t^ " rj 

 •vO t^ t^ rO -i-CO OD rn Tt- C^ rovC O OO 

 ri ro r^ O r^.-tx. rn t^ l^ Cs t~~ ^ C/0 



t^ o\D covccovocooco^co^ocoocoocoooo 



O -T-CO t^ i-^ CJs Th\0 t^ C « roo l>- •- '^ " lo tj-c 

 O O CO O CNvC CO "-. r^ lo r^ Tl- o^vC Ir^ M" ro O CO 



ococ:cocco\Dco\C!coocooa30covoa>vo< 



o O CO CO T^ •5- CN > 



CO fO r^ t^ O O 



(^ r<0 ro ro 



rO POvO vO ■^ '^ ■*■ '^vO O t>- 1~> On Cv '1 



>. 



1: u 



=: u ^^ 



S i5 2 -y^ ^ 



