ship. The instrument can be floated above a mooring at mid-depths 
to measure movements there. When it is desired to pick it up, an 
explosion signal floats it up with its records. This device is 
(16) 
working successfully. The collection of data will start shortly. 
Diffusion Experiment with Drift Bottles: One great weakness 
of the radioactive and dye tracers is that they become too diluted 
to measure. Drift bottles do not. For intermediate depth experi- 
ments bottles or other types of drift particles have to be placed 
at the desired depth to remain there until measured some time later. 
It may be possible to develop an oceanographic version of the constant 
altitude balloon used atmospheric work. In order to keep track of 
the subsurface floats, time bombs on them could be fired and the 
positions determined by a SOFAR ee Drift bottles would 
not give the small end of the turbulence spectrum as well as a tracer 
but they should at least give the large scale heres 
Dr. Parr of the New York Museum of Natural History suggested 
that the distribution of the Caribbean might be followed with some 
of the foraminifora. These organisms grow in the tropical sea and 
are transported out in the currents. Perhaps Carribean plankton 
(27) 
or some similar indigenous material be used. 
Br fac 
