  Spectroscopic observations of the hybrid V458 Vul obtained between days 9 and
778 after the brightness maximum are analyzed. Short-period, daily profile
variations of forbidden [FeVII] iron lines were detected in the nebular phase,
as well as a long-period (about 60-day) cyclic variation that was correlated
with the photometric and X-ray cycles. The abundances of helium, neon, and iron
in the nova's envelope have been estimated. The helium, neon, and iron
abundances exceed the solar values by factors of 4.4, 4.8, and 3.7. The
envelope mass is 1.4$\times$ 10$^{-5}$M$_{\odot}$. The electron temperatures
and number densities have been calculated for the Northwestern and Southeastern
knots of the planetary nebula. The temperature derived for the Northwestern
knot is Te = 10 000 K and the electron number density, n$_{e}$ = 600 cm $^{-3}$
for the Southeastern knot, Te = 13 000 K and n$_{e}$ = 750 cm$^{-3}$.
