There is always one nucleus and one vacuole, but both may be more numerous.
We have received the impression that we have here to deal with a vacuole filled with substance secreted by the cell.
The number of the vacuole containing cells is 15-20% of the colourless blood corpuscles.
At each end of the cell is a vacuole containing small granules that show an active dancing movement.
This is done by pulsation of the vacuole, which ultimately bursts, passing fluid waste to the outside.
These masses of food seem to be inclosed within a little area containing fluid, called a vacuole.
Later on this vacuole disappears, and the grains of pigment make their appearance.