[R] Different lm() Residuals Output

[Rich Shepard]

   All but one of the summaries of multiple linear regressions in this
analysis set present the residuals by min, 1Q, median, 3Q, and max. Example:

lm(formula = TDS ~ Cond + Ca + Cl + Mg + Na + SO4, data = snow.cast)
Residuals:
      Min       1Q   Median       3Q      Max -277.351  -32.551   -2.621 
40.812  245.272

The one that doesn't has only a small number of rows (23) and presents the
results as:

lm(formula = TDS ~ Cond + Ca + Cl + Mg + SO4, data = rnchH.cast)
Residuals:
       8       9      10      11      12      13      14      16      20  21 
-2.1926  3.2306 -3.9823 -4.0491  0.5284  1.9354  2.4798  0.8952 -3.0642  0.8781
      22
  3.3408

   What might cause this difference?

Rich