Trans.Roy. Soc. I 
— [ 
A 
Plate XIIL 
A3 
A4 
AS 
A6 
m 
Bl 
$2 
$3 
84 
12 
4 \ \ 
24 
36 
48 
60 
72 
'n inchek 
24 
Be 
12 
36 
A , L 4, 
/■6/0 
I ! 
48 
60 
72 
-1- 
/•7% 
+ — I 
/'7% 
I 
T 
I i 
1 ^ T 
Wcst,Mev/ma.n lith. 
