400 
400 
375 
375 
350 
$25 
325 
300 
300 
2765 
250 
225 
225 
200 
i) 
o 
a 
175 
75 
150 
150 
125 
825 
100 
160 
489s 
SfEs 
Stes 
6ees 
Sées 
ooes 
vess 
eess 
bss 
afv 6tes 
S{v 2295 
s‘v ofes 
a‘v ezas 
av gzes 
atv izeg 
afv eases 
s‘v zess 
8°” ozsg 
e‘v 6igs 
ea‘e oes 
av 2igs 
a'y oes 
e‘v sigs 
llusks obtained at each station. 
iving mo 
Average number of 1 
Fig. A—Specimen curve. 
