Page 502 - Applied Pharmacognosy

• ….direct counting and by calculations based on sp.
gravity and dimensions of spore.

• The spore is a quarter of a sphere.
Type of countable particles

1. Small discrete particles such as pollen grains or starch
granules and stone cells.

2. Flat, plate-like particle is a single layered tissues or cells
the area of which may be traced at a definite magnification
and the actual area calculated.

(epidermal area measurements)