52 



Mussel 6 (medium size), total amount of fluid 2 5 c.c., after 6 days' 



change contained 6,250 B. typhosus per mussel. 

 7 (medium size), total amount of fluid 5 c.c., after 7 days' 

 change contained 14,200 B. typhosus per mussel. 



This experiment could not, unfortunately, be continued, 

 because the remaining mussels could not be kept alive. But 

 as far as it goes it shows that mussels take up the B. typhosus 

 from the surrounding water with great ease, the first mussel 

 having taken up in 24 hours from the infected water the 

 B. typhosus to the enormous amount of over six millions 

 greater in proportion than what was observed with oysters or 

 cockles. Notwithstanding the daily change of sterile sea 

 water during five days, there were still discovered in the 

 mussels B. typhosus in considerable numbers. But on the 

 whole there may be said to have been going on a distinct 

 decrease of the B. typhosus in the animal slower than was 

 the case with the oysters, quicker than with the cockles. No 

 increase of the microbe, as in the case of the cockles, was 

 noticed; and therefore it seems justifiable to say that in 

 respect of dealing with the ingested B. typhosus, the mussel 

 stands between the oyster and the cockle that is, it is capable 

 of ingesting the B. typhosus from the surrounding water in 

 greater proportion than either the oyster or the cockle, 

 and the B. typhosus does not undergo increase within the 

 mussel. 



Table YI gives the summary. 



Mussels in sea water infected with B. typhosus to the 

 amount of over 5 millions per 1 c.c. 



Mussel 1 (large), kept 24 hours in infected sea water, contained 



over 6,000,000 B. typhosus. 

 2 (medium), 1 day after change, contained over 74,000 



B. typhosus. 

 3 (large), 2 days after change, contained over 628,660 



B. typhosus. 

 ,, 4 (medium), 3 days after change, contained over 36,000 



B. typhosus. 



