In the following Vedaic hymns, agni is fire; Indra, the sky, firmament, or atmosphere; and Marut, the cloud.
"The Ethnology of the British Colonies and Dependencies"
Robert Gordon Latham
He said, "If a man for a hundred years worship agni in the forest, and if he but for one moment pay homage to a man whose soul is grounded in true knowledge, better is that homage than sacrifice for a hundred years."
"A Biographical Dictionary of Freethinkers of All Ages and Nations"
Joseph Mazzini Wheeler
On agni, they use silver for sewer-pipe.
"Space Viking"
Henry Beam Piper