Letter to Sir Archibald Geikie from PB Brodie discussing the differences between Scottish and English lias formations (jurassic). He concludes that corals found in the Scottish lias are from lower levels in the series than those from Gloucestershire and Worcestershire where the outlines of old coral reefs can be seen on the surface, and fossil coral can be picked up in fields and at the side of the road. He sends some references concerning the subject, offers to send some local fossils, and asks Geikie to organise a fossil swap between himself and the museum in Edinburgh. He also asks if Geikie knows where he can obtain a specimen of Liberian crustaceans.