What I normally do is to let the seeds germinate in a petri-dish after they
had been soaked in 500 ppm (500 mg/l) Gibberellic acid, although the latter
is not obligatory, like with Byblis gigantea.
If the seeds don't germinate, it's posiible that you just have a bad batch of
too old seeds. Last year I had 4 different seed batches of Drosophyllum, of
which three germinated (the oldest being 8 years old!), and one didn't,
although this was a batch from 1995 (at least according to the label).
After germination the plantlets are transferred to pots and further treated
according to the method described in Slack's book.
Hope this helps.
Martin Zevenbergen
martin.zevenbergen@algem.pt.wau.nl