29 



amount 3*3 c.c.; made two Drigalski plates, each with 150 

 cubic millimetres (0'15'c.c.). Both plates together had 4 

 colonies (three in one, one in the other) of B. typhosus this 

 would be 44 B. typhosus for the whole oyster. 



Six days dry, oyster 10 total amount 0*4 c.c.; -fa c.c. 

 produced in a Drigalski plate 70 colonies of B. typhosus 

 amounts to 280 B. typhosus per whole oyster. 



Seven days after change in sterile sea water, oyster 11 

 total amount 3 c.c. ; T ^ c.c. produced in a Drigalski plate 

 colonies of B. typhosus. 



Seven days dry, oyster 12 total amount of fluid 1*5 c.c. ; 

 T ^ c.c. produced in a Drigalski plate 34 colonies of B. typhosus 



this is equal to 510 B. typhosus for the whole oyster. 



Nine days after change in sterile sea water, oyster 13 

 total amount 2 c.c. ; -fa c.c. produced in a Drigalski plate 

 colonies of B. typhosus. 



Nine days dry, oyster 14 total amount 1-5 c.c. ; fa c.c. 

 produced in a Drigalski plate six colonies of B. typhosus 



this amounts to 90 B. typhosus per oyster. 



Tabulating the results of Experiment II we find thus : 



TABLE II. 



Oyster 1 after 24 hours in typhoid-infected sea water contained 



40,000 B. typhosus. 



3 after 1 day in clean sea water 1380 B. typhosus. 



5 2 days 440 



55 ' 55 5 55 55 55 82 ,, 



J) " 55 " ,, 5, ?> 44: 



55 11 55 55 55 55 



55 13 - ,5 9 



Oyster 2 after 1 day dry ..... 40,000 B. typhosus. 



4 2 days ..... 3700 



6 3 ..... 700 



55 8 5 ..... 150 



10 6 . . . . . 280 



12 7 ..... 510 



55 14 9 ..... 90 





