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Agnaadheya ceremony starts with the collection of arani (the samidha wood) and ends in purnaahuti (offering at the end of ceremony). Once the fire is kindled by Arani, it is maintained by the addition of smaller pieces of wood called Samidhas into the Agni. These pieces of wood are collected with bark and are 10 to 12 inches long. This process is called "Pratyavaroha"<ref name=":0222222">''[http://www.kamakoti.org/kamakoti/dharmasindhu/bookview.php?chapnum=23 Essence of Dharmasindhu - Homa Prakriyas]'' by Sri. V. D. N. Rao as given in Kamakoti.org  </ref>.Agni samaaropa and pratyavaroha are to be executed by the karta himself and not by others except by his wife who might perform the Pratyavaroha part.   

Agnaadheya ceremony starts with the collection of arani (the samidha wood) and ends in purnaahuti (offering at the end of ceremony). Once the fire is kindled by Arani, it is maintained by the addition of smaller pieces of wood called Samidhas into the Agni. These pieces of wood are collected with bark and are 10 to 12 inches long. This process is called "Pratyavaroha"<ref name=":0222222">''[http://www.kamakoti.org/kamakoti/dharmasindhu/bookview.php?chapnum=23 Essence of Dharmasindhu - Homa Prakriyas]'' by Sri. V. D. N. Rao as given in Kamakoti.org  </ref>.Agni samaaropa and pratyavaroha are to be executed by the karta himself and not by others except by his wife who might perform the Pratyavaroha part.   

The trees from which samidhas are obtained include : palaasa, asvattha (peepul), nygrodha (banyan tree), sami, aamra (mango), khadira, durva, darbha (kusa grass), bilva (bael) Apaamarga.  

The trees from which samidhas are obtained include : palaasa, asvattha (peepul), nygrodha (banyan tree), sami, aamra (mango), khadira, durva, darbha (kusa [[कुशा का महत्त्व]] grass), bilva (bael) Apaamarga.  

=== यज्ञोपकरणानि ॥ Upakaranas used in Yajnas ===

=== यज्ञोपकरणानि ॥ Upakaranas used in Yajnas ===