1-3, and another, I.22.
5-8.

In the latter, Agni's (Fire's) title, 'son of waters,' is given to Savitar, who is virtually identified with Agni in the last part of the Rig Veda; and in the former hymn there is an interesting discrimination made between Savitar and P[=u]shan, who obeys him.

The last hymn in the collection to Savitar, X.149, although late and plainly intended for the sacrifice (vs.

5), is interesting as showing how the philosophical speculation worked about Savitar as a centre.
'He alone, he the son of the waters, knows the origin of water, whence arose the world.' This is one of the early speculations which recur so frequently in the Brahmanic period, wherein the origin of 'all this' (the universe) is referred to water.

A hymn to Savitar in the first book contains as excellent a song as is given to the sun under this name.