Note 67:7 — Chapter VIII

"It has many heads, one being immortal, as the storm must constantly supply new clouds while the vapors are driven off by the Sun into space. Hence the story went that although Herakles could burn away its mortal heads, as the Sun burns up the clouds, still he can but hide away the mist or vapor itself, which at its appointed time must again darken the sky." (Cox: Aryan Mytho., vol. ii. p. 48.)