Buddha Abhidhamma - Ultimate Science - BuddhaNet

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Then considering the fact that all the material group in the
present life will dissolve in this life and will not pass on to the
future life, he again meditates on the present material group as
anicca, dukkha and anatta.
He meditates in the same way on the four mental groups,
considering one group at a time.
3 Santati-sammasana Method
This method investigates the conditioned things in the 31 planes
of existence in terms of continuous series.
To practise this method the yogi divides the corporeal
groups in one life as a series of hot råpa, a series of cold råpa,
etc. He then meditates thus:
“The hot series or råpa has all dissolved. It does not pass
on to the cold series of råpa. Because of its nature of dissolution,
it is anicca. Because of its nature of fearfulness, it is dukkha.
Because of its nature of not ‘ego or atta’, it is anatta”.
Similarly considering the various cognitive series of
consciousness, he meditates that cakkhu-dvàra vãthi-cittas dissolve
soon after they are formed and they do not pass on to sota-dvàra
vãthi-cittas that sota-dvàra vãthi-cittas also dissolve soon after they
are formed and they do not pass on to ghàna-dvàra vãthi-cittas,
and so on. So they are anicca, dukkha and anatta on account of
their dissolution, fearfulness and not ‘ego or atta’ natures.
4 Khaõa-sammasana Method
This method investigates the conditioned things in the 31 planes
of existence by way of momentariness. He meditates like this:
“The corporeal group which is formed in the past moment
has all dissolved in the past. It does not pass on to the present