Ogi wants to make bobipancakes but doesn't have any ingredients and the shop is closed. Where do flour, eggs and milk come from before they go to the shop then? asks Ogi. Maybe they grow on trees, says Nib. Luckily, Ffion Farmer calls by and takes them on a trip to her farm to find out the answers.

Presented in a style intended for the non-specialist reader, with technical terms and mathematical formulae kept to a minimum, the second edition of this introduction to groundwater covers a range of topics as they relate to hydrogeology. A major new chapter focuses on pollution.

It's St David's day and the bobinogs are in the mood for a party. Mam-gu Bobinknot is busy preparing Cawl for the street party and the Bobinogs are practicing their special song. But, poor Nib doesn't have a costume and decides she can't go to the party. Will Mam-gu Bobinknot and her knitting needles be able to save the day?

One morning, Bobin discovers a very remarkable egg on the doorstep. Before long, a cracking noise begins and out pops a baby dragon. 'We can't keep him as a pet' says Nib. 'It's too dangerous'. 'The egg must have rolled down from dragon mountain' says Bobin. The Bobinogs decide that they must take little Sizzlepuff back to his mother.

Second edition.