• “[Encountered coloured water] extending about two miles from North to South and about six to eight hundred fathoms from West to East. The colour of the water was yellow.”                                              May 1735
Don Antonio de Ulloa
1716-1795
Politician, explorer, scientist
(Discoverer of platinum)
Go through.

Because of observations like this early emphasis on isolated patches
   - causes
   -dynamics
What determines the size of a patch?