FLIERS AND OTHER MICROSTRUCTURES IN PLANETARY-NEBULAE .3.

Long-slit spectroscopic observations along the major axes of four plan etary nebulae with interesting jets and FLIERs (Hb 4, IC 4634, NGC 636 9, and NGC 7354) have been conducted with the Palomar 5 m telescope. C hemical abundances and physical conditions (n, T) in microstructures w ere derived along their structural axes. No evidence of conspicuous sh ock activity or N/O abundance anomalies is seen in most cases, unlike some earlier studies of similar features in other planetary nebulae. M icrostructures seem to be a heterogeneous class of structures aside fr om their low ionization and generally supersonic motions.