Hi, There's a whole area of practical experience that separates things on whether they float or not - bad eggs float good eggs sink. This is really weighing things, and it is possible to separate good seed from bad by weighing each seed (given patience and a sensitive enough scale). The good ones are the heaviest. So seed that sinks is likely to be the most viable. But some seed even when viable is not going to sink, some seed, e.g. coconuts, has evolved to float when viable. -- David Pilling http://www.davidpilling.com/ _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…