**Table 15:** Comparison of abundances in PN with WR central stars.
Elem.	NGC 40	BD+30 3639 $^\natural$	NGC 5315 $^\dagger$	Solar(3)
He	$\geq$ 0.046	$\geq$ 0.0053	0.124	0.098
C(-4)	19	7.3	4.4	3.3
N(-4)	1.3	1.1	4.6	0.84
O(-4)	5.3	4.6	5.2	4.9
S(-6)	5.6	6.4	12	21
Ar(-6)	3.4	5.2	4.6	2.5
Ne(-6)	1.4	1.9	1.6	1.2

$^\natural$ Abundances from Bernard-Salas et al. (2003).
$^\dagger$ Abundances from Pottasch et al. (2002).

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