In 1666 Christopher Merrett published Pinax rerum naturalium britannicarum, this essentially being a catalogue of British plant localities known at the time together with a few other items of natural history. What is thought to be the author's personal annotated copy is held in the British Library. These annotations have been examined and the hand-writing compared to surviving examples known to be either of the author or of one of his sons and are now transcribed. Brief biographical notes relating to Merrett and to the background to his production of the Pinax are also given.