- 4 - 
and has saved a great many hours* 
All of the enclosures have skeletons of angle and channel iron, 
treated and painted and bolted together* We have one cage 3*x3’x4* which 
is to be used for keeping specimens until we need them. It is covered with 
galvanized hardware cloth and has full-size sliding doors at each end. Then 
there is the main shooting enclosure, of the same basic construction, but 
five-sided and considerably larger. It has three walls 3 *x3 * also of hard- 
ware cloth to allow free water movement through the structure when the 
glass is on. The top is small -mesh netting fastened with removable wooden 
strips so that adjustments can be made inside without removing a glass or 
one of the screens. The permanent screen panels in this main cage actually 
are sliding doors for introducing specimens at the proper time. An auxi- 
liary cage 3’x3*x4* can be attached to either end of the shooting enclosure, 
and has doors that match its openings. This cage has removable screens 
that can be replaced with windows for use in locations where a large enclo- 
sure is not necessary® I have found such enclosures to be necessary when 
one is trying to learn and record behavior. Reef animals placed in them 
are puzzled for a short while at being able to see their old haunts and 
not to be able to get to them through the glass. Then they settle down and 
carry on as though they were out in the open. Only a few of the wanderers — 
baraoudas, squids, jacks, and the like, are not happy in such places. 
Today we are reinforcing the edges of our undersea windows with aluminum 
channels, the holding pen is out where we worked in 1958 with a small remora 
