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openings to go out of. They wouldn’t go. ^Vhon I crawled into the pen to 
chase them out they would circle wildly to escape, but never venture past 
the place v/here the glass had been. It took ten minutes to convince them 
that they were free. Finally they broke through the invisible barrier and 
swam avmy. They had bean in the pen about ten days. 
August 3. 
This day wo set out on a new project. Dr. Chace had sent in a request 
for one of the fish (fierasfer) that inhabit the cucumber, and we spent the 
morning gathering holothurians . They are relatively scarce here, and for the 
most part are well hidden under the edges of the rocks that surround the 
coral heads# In the course of two hours we gathered ten or a dozen and 
brought them up and deposited them in a tub of water in the shade of a tree, 
hoping that when the water had gone stale the little fish would come out 
to look for something better. This turned out to be the case, but it hap- 
pened sooner than wo had expected. 
Dr. Schmitt went outside to check our tubful after lunch and found 
several fierasfors lying on the grass near the tub. They had left their 
hosts and leaped the rim. All but one were dead# Y\fe rushed about and put 
them into fresh seawater, and happened upon one that had Just left his 
cucumber. He hopped forthwith out onto the ground, but we scooped him up 
and put him into the bucket. Dr. Schmitt brought out bottles of ice to 
cool the water, and we gave the little fish our best attention to try to 
keep it alive. He was about six inches long by an eighth of an inch at 
