Buddha Abhidhamma - Ultimate Science - BuddhaNet

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The pañibhàga-nimitta will be in front of him so long as he
still has a subtle desire (nikanti) for it. When that desire is gone,
the pañibhàga-nimitta is also gone unfolding infinite space.
Concentrating on this space, he meditates on: “Space is infinite!
Space is infinite!’.
When his desire (nikanti) for the råpàvacara fifth jhàna
disappears, he is said to reach upacàra-bhàvanà. If he goes on meditating
earnestly and strenuously, he may soon reach the appanàbhàvanà
and attain the first aråpàvacara jhàna called ‘àkàsàna¤càyatana
kusala citta’.
He then develops the five abilities (vasità) with respect to
the first aråpa jhàna. Then to develop the second aråpa jhàna, he
contemplates on the unsatisfactoriness of the first aråpa jhàna
for being close to råpàvacara-jhànas and being coarse compared
to the second aråpàvacara jhàna. Then concentrating on
àkàsàna¤càyatana kusala citta which focuses on infinite space, he
meditates: “consciousness is infinite; consciousness is infinite”.
This is the new parikamma-bhàvanà. When his subtle clinging
(nikanti) to the first aråpàvacara jhàna disappears, he comes to
upacàra-bhàvanà. When he attains the second aråpàvacara-bhàvanà.
when he attains the second aråpàvacara jhàna called ‘vi¤¤àna¤càyatana-kusala
citta’, he reaches appanà-bhàvanà.
Similarly by practising the parikamma-bhàvanà on the nonexistence
of àkàsàna¤càyatana kusala citta, mentally repeating:
“There is nothing whatsoever!”, the third aråpàvacara jhàna, called
‘àki¤ca¤¤àyatana kusala citta’, is attained.
Furthermore by practising the parikamma-bhàvanà on
àki¤ca¤¤àyatana kusala citta, mentally repeating: “This citta is
calm! It’s excellent!’, the fourth aråpàvacara jhàna called ‘nevasa¤¤à-nasa¤¤àyatana
kusala citta’ is finally attained.