The Pollen data plotting and analysis program psimpoll is freely available to users via the ftp site ftp://ftp-palecol.plantsci.cam.ac.uk/ and can be downloaded to either IBM or Macintosh compatible computers. For those who have experienced difficulty downloading the program (psimpoll.bin or pscomb.bin) to their macintosh computers there are a couple of free translator programs that will solve this problem. The *.bin files are binhex applications which are best translated by the program MacBinary II+ (available at http://www-palecol.plantsci.cam.ac.uk/computing.www.html). It is also important to have Stuffit Expander which will enable many application downloads from the WWW to be easily mounted on your macintosh (also available at the same www page). Once you have psimpoll loaded it is worthwhile allocating at least 640K memory (via Get Info command) so that large data sets can be easily handled.