dhātu
'elements', are the ultimate constituents of a whole.
(1) The 4 physical elements (dhātu or mahā-bhūta), popularly called:
- earth, (pathavī-dhātu)
- water, (āpo-dhātu)
- fire, (tejo-dhātu)
- wind, (vāyo-dhātu)
are to be understood as the primary qualities of matter.
In Vis.M. XI, 2 the four elements are defined thus:
"Whatever is characterized:
- by hardness (thaddha-lakkkhana) is the earth or solid-element;
- by cohesion (ābandhana) or fluidity, the water-element;
- by heating (paripācana), the fire or heat-element;
- by strengthening or supporting (vitthambhana), the wind or motion-element.
All four are present in every material object, though in varying degrees of strength. If, for instance, the earth element predominates, the material object is called 'solid', etc. - For the analysis of the 4 elements, s. dhātu-vavatthāna.
(II) The 18 physical and mental elements that constitute the conditions or foundations of the process of perception, are:
- 1. visual organ (eye)
- 2. auditory organ (ear)
- 3. olfactory organ (nose)
- 4. gustatory organ (tongue)
- 5. tactile organ (body)
- 6. visible object
- 7. sound or audible object
- 8. odour or olfactive object
- 9. gustative object
- 10. body-impression
- 11. eye-consciousness
- 12. ear-consciousness
- 13. nose-consciousness
- 14. tongue-consciousness
- 15. body-consciousness
- 16. mind-element (mano-dhātu)
- 17. mind-object (dhamma-dhātu)
- 18. mind-consciousness-element (mano-viññāna-dhātu)
1-10 are physical; 11-16 and 18 are mental; 17 may be either physical or mental.
16 performs the function of advertence (āvajjana) towards the object at the inception of a process of sensuous consciousness; it further performs the function of receiving (sampaticchana) the sensuous object.
18 performs, e.g., the function of investigation (santīrana), determining (votthapana) and registering (tadārammana) - (for its other functions, s. Table I).
For the 14 functions of consciousness, s. viññāna-kicca.
Cf. M. 115; S. XIV and especially Vibh. II (Guide p. 28f), Vis.M. XV, 17ff.
Of the many further groupings of elements (enumerated in M.115), the best known is that of the 3 world-elements:
- the sensuous world (kāma-dhātu),
- the fine-material world (rūpa-dhātu),
- the immaterial world (arūpa-dhātu);
further the six-fold group:
- solid, (pathavī)
- liquid, (āpo)
- heat, (tejo)
- motion, (vāyo)
- space, (ākāsa)
- consciousness (viññāna; s. above I), described in M.140; see also M.112.