(iv)  After this the cactus-plant is a
better illustration, for its fleshy "leaves"
are covered with sharp spines, each of
which may be compared to a nation or
tribe of human beings.
*


6.)  Now our Fifth Root-Race has
already been in existence -- as a race
sui generis [unique] and quite free from
its parent stem --
about 1,000,000
years
;


(
i)  therefore it must be inferred that
each of the four preceding Sub-Races
has lived approximately 210,000 years;
thus each Family-Race has an average
existence of about 30,000 years.


(
ii)  .. although the nations or the
innumerable spines upon it, vary with
each succeeding "season" of three
or four thousand years
. .. *
5.)  The human Race has been
compared to a tree, and this serves
admirably as an illustration.

(
i)  The main stem of a tree may be
compared to the
ROOT-RACE (A).

(
ii)  Its larger limbs to the various
SUB-RACES; seven in number (B1, B2).

(
iii)  On each of these limbs are seven
BRANCHES, OR FAMILY-RACES. (C).
* Blavatsky, The Secret Doctrine Vol. II