[R] Problem installing packages

[Fredy Mejía]

Dear R-experts,

	I'm a new R user and so far have no complains about ir.  However I 
still can't figure out how to install packages.  I'm running the R 1.5.0 
(Carbon) under OS X.  I just downloaded some packages from CRAN (Tree, 
among them) and moved them to the library folder in R.  When the R session 
started, I was expecting that using the command library(tree) would do it,
  but the program replied the following message:

 > library(tree)
Warning message:
Package  `Tree' contains no R code in: library(Tree)

Could someone tell me what's missing?

Fredy Mejía

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