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The ISO and IUE spectra of the elliptical nebulae NGC40 and NGC6153 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebulae is then calculated and compared to previous determinations. A discussion is given of: ( 1) the recombination line abundances, (2) the exciting stars of the nebulae, and (3) possible evolutionary effects

Abundances of planetary nebulae NGC 40 and NGC 6153