SEA-FISHERIES LABORATORY. 



365 



The colony from mussel 4 was a typical white colony. 

 Those from mussels 5 and 7 were " colon-like " colonies. 

 Those from mussels 1, 2, 3, 6, 8 and 10 are typical colon 

 bacilli. The others are not this microbe. Six colonies 

 out of nine are therefore Bacillus coli. The white colonies 

 on these and the next series of plates are being studied 

 further. 



Sea-water Analyses. 



On our first visit two samples of water were taken : 

 one from off the Scar opposite the beach and the other 

 from near the Bridge. These were diluted so that various 

 solutions of different strengths were obtained, and cultures 

 were made in neutral-red, bile-salt, lactose agar. The 

 results are as follows : — 



Off Scar, opposite 

 Perch 



Amount of 

 original water 

 sample taken. 



1 c.c. 

 0-1 c.c. 

 0-01 c.c. 

 0-001 c.c. 



No. of colon- 

 like colonies. 



16 



1 



1 



sterile 



Near Bridge 



1 c.c. 

 0-1 c.c. 

 0-01 c.c. 

 0-001 c.c. 



19 



2 

 sterile 

 sterile 



On our second visit three samples of water were 

 taken : one from below Deganwy, one from off Bodlondeb 

 Point, and one from opposite Conway. The samples were 

 collected in 500 cc. bottles. One cc. was taken from near 

 the top of each bottle, and 1 cc. from the bottom layer. 

 These were examined as before, with the following results : 



