  Two days of observations were conducted at the Palomar Observatory during the
nights of 25 and 26 February 1997 with the Hale telescope, in order to search
for rapid variability in the near-infrared (NIR) bands J, H, Ks for a selection
of eight blazars. With the possible exception of PKS 1156+295, no intraday or
day-to-day variability was observed during these two nights. However, for these
eight blazars, we have measured the NIR spectral indices.
