  Twenty five low redshift quasars have been monitored for several decades at
five near- and mid-infrared wavelengths to detect rapid variations which would
indicate that a nonthermal component was present in the "10 micron bump". Such
variability has apparently been detected in several radio loud quasars and in
the radio quiet quasar PG1535+547. In addition, the structure function of
PG1226+023 shows that an apparently periodic component is present in its
near-infrared emission.
