Four letters containing information involving geological works as well as sharing personal information about Bunbury and Lyell's lives.
1) Bunbury mentions that he received broken specimens that revealed and helped him to analyse the inner texture of the specimen carefully. He also mentions of Mary's recovery from ill health.
2) Refers to geologist William Hooker as well as Leyden. Discusses Lyell's "Principles"- pg. 327, 10th edition. He suggests Lyell to write another edition of Lyell Principles. Mentions Lyell's sister.
3) A further discussion on Lyell's Principles of Geology
4) Discusses Lyell's geological researches , geology of Forfarshire, rock compounds, ancient volcanoes of Scotland. Writes of Barton, his residence- that there has been a lot of draught recently. Bunbury's brother is recovering his health. There was also a criticism of German botanist Schimper's works.