Burlings Indigo Very little matter, very pure 5 Off Tarifa Undecided Thicker than No. 5 7 Twelve miles Yellow-green Very thick from Cadiz 11 Between Capes Deep Indigo Very little matter, very pure 12 Off the Burlings. Strong green Thick, with fine particles 3 Off Cabreta Point Bright green Still thick, but less than a year my “Indoo” turned up, bringing a smiling crowd, and delivered over to the Newtonian reflector a plane perpendicular to its zero.