The text discusses the adoption of small circles with powerful reading micrometers in place of large circles with verniers by continental manufacturers. It describes a simple process for making relief maps in Germany by cutting contour strips from a contoured map and pasting them onto cardboard. The report is described as very interesting. The text then reviews "Green's Geology," a textbook by A. H. Green. The third and enlarged edition is praised for its improvements, particularly in the lithological sections and crystallography. While some sections, such as the description of confusedly crystalline rocks, are criticized for their title and content, the chapter on metamorphic rocks is considered excellent. The book is noted for its balanced approach and judicial impartiality, and is recommended for its value in geological studies. The text also discusses "Our Book Shelf," focusing on "A History of British Birds" by William Yarrell, revised by Alfred Newton and continued by Howard Saunders. The text notes the transition from Newton to Saunders as editor, acknowledging Newton's contributions and Saunders' potential to complete the work. Saunders begins his second volume with a discussion of pigeons, including British and American species, though some inaccuracies are noted. The text concludes with a brief mention of the book's structure and content.The text discusses the adoption of small circles with powerful reading micrometers in place of large circles with verniers by continental manufacturers. It describes a simple process for making relief maps in Germany by cutting contour strips from a contoured map and pasting them onto cardboard. The report is described as very interesting. The text then reviews "Green's Geology," a textbook by A. H. Green. The third and enlarged edition is praised for its improvements, particularly in the lithological sections and crystallography. While some sections, such as the description of confusedly crystalline rocks, are criticized for their title and content, the chapter on metamorphic rocks is considered excellent. The book is noted for its balanced approach and judicial impartiality, and is recommended for its value in geological studies. The text also discusses "Our Book Shelf," focusing on "A History of British Birds" by William Yarrell, revised by Alfred Newton and continued by Howard Saunders. The text notes the transition from Newton to Saunders as editor, acknowledging Newton's contributions and Saunders' potential to complete the work. Saunders begins his second volume with a discussion of pigeons, including British and American species, though some inaccuracies are noted. The text concludes with a brief mention of the book's structure and content.