672 DAVID HILT TENNENT. 
and anchored in the water beneath the wharf. The remainder 
were allowed to remain out of water for twenty-four hours, 
and were then placed sixteen in one cage and eighteen in 
another and anchored beside the first cage. 
On August 24th the oysters were removed from cage No. 1. 
‘Ten of the oysters had died. Of the remaining twenty none 
were infected. 
On September 2nd the oysters were removed from cage 
No. 2. Two of the oysters had died. Of the remaining 
fourteen none were infected. 
On September 16th the oysters were removed from cage 
No. 3. One of the oysters had died. Of the remaining 
seventeen none were infected. 
The results of the foregoing experiments I regard as 
negative. While I do not believe that infection is communi- 
cated from one oyster to another, I do not regard these 
experiments as furnishing conclusive evidence that such 
transmission does not take place. 
Feeding Experiments for the Purpose of Deter- 
mining the Further Life-history of B. haimeanus. 
My second set of experiments was carried on in August 
and September, 1903, when I attempted to obtain the adult 
form of the parasite by feeding infected oysters to fish which 
were kept in aquaria. ‘These experiments were tried on six 
species of fish. Oysters were opened and the infected ones 
selected, torn in pieces, and thrown into the aquaria. ‘They 
were eaten greedily. 
Thirty minutes after feeding I removed the stomach and 
intestines from one of each of the species fed and found that 
although most of the cercarie were dead, some were still 
alive. 
Thirty minutes later, or an hour after feeding, I removed 
the stomach and intestines from one of each of the species 
fed and could find no living cercarie. 
A diet which consisted of infected oysters exclusively was 
I 
