SEA-FISHERIES LABORATORY, 215 
SILVERDALE: Rersu.Lts or TERTIARY SUB-CULTURES. 
; a ; a 
s o a 2D rb) 5 o | 
o i/,} isp) (oe) 701 o ~ . | les} 
al a “= S a 
a) 8 $ =| = © s nS td = 
—— = 2 ana ae S a = = fy 
a = es) ese al Ave = =, =| a ie 
MO O 4 Pie vn, ee 2 <q Faas eel ee 
er -— = b : u 
1 ag a ag a ) ag ) a  posi- 
tive 
2 ag ag ag 0 0 0) Oy) a ( 0) 
3 ag ag, ag a a 0) a ac 0 
4 g ag Oa eO 0) 0) 0) ac 0) 
5 a a | a | ag 0 0) a a C 7) 
6 ag ag ag|) oO 0) ) 0) OW) 
| 
( 
Meeaowrhn port cockle beds. 
Two samples (a and 6) were collected: (a) from the 
sands just Hast from Southport Pier and (6) from near 
the same place, but close to a small pool on the sands. 
Several Banks fishermen were cockling at the place from 
which the latter samptes were taken. The sands were 
very clean, and there were no indications of sewage 
pollution. 
SOUTHPORT: RESULTS OF PRIMARY CULTURES. 
Dilution. | No. of Red Colonies. Enteritidis Reaction. 
ite 1 1 (sterile) Typical 
(4 Sterile No change 
h anaes | 2 (2) Typical 
en D Sterile No change 
No tertiary sub-cultures were made. 
ieciustons trom’ the Results of 
Cockle Analyses. 
The results of the above analyses may now be 
arranged so as to express the relative pollution in each 
locality. For this purpose the numbers of red colonies 
