Passive ventilation in benthic annelids?

NdCoO3, and LaCoO3, are strikingly similar to each other and to RCo03 where R (6) is the natural rare earth mixture as mined. We suggest, therefore, that the unseparated rare earth oxides can be used to make a cheap auto exhaust oxidation catalyst. LEE A. PEDERSEN W. F. LIBBY Department of Chemistry and Institute of Geophysics and Planetary Physics, University of California, Los Angeles 90024 References and Notes