=Tour through the Islands of Orkney and Shetland.= By the Rev. George Low, with introduction by Dr. Joseph Anderson. (Kirkwall, 1879.) An interesting account of the appearance of the Islands at the end of the eighteenth century. Geology. There is no book dealing specifically with the geology of Orkney. Recourse must be had either to books dealing with the science generally, or to those dealing with the Islands in which their geology is included. =The Orkneys and Shetland= (Tudor) contains an account of the geology of the islands, written by Drs. Peach and Horne, with a useful geological map. The most recent and complete geological survey of Orkney is that by Dr. J. S. Flett, an account of which is contained in two papers in the =Transactions of the Royal Society of Edinburgh=. Some of Hugh Miller’s works, such as =The Testimony of the Rocks=, =The Old Red Sandstone=, =Rambles of a Geologist=, and =Footprints of the Creator=, contain numerous references to the geology of Orkney. =Robert Dick=, by Dr. Samuel Smiles, is an interesting account of a Thurso baker who devoted his life to the study of geology in Caithness, where the rook formation is the same as that of Orkney. Among general works in geology suitable for beginners may be mentioned Huxley’s =Physiography= and Sir Archibald Geikie’s =Outlines of Field Geology=, his =Class-book of Geology=, and his =Scenery of Scotland=. Botany. =The Orkneys and Shetland= (Tudor) contains a list of the rarer British plants found in Orkney, compiled by W. I. Fortescue. Volume xviii. of the =Transactions of the Botanical Society of Edinburgh= contains a complete list of Orkney plants by Prof. J. W. H. Traill. Another list is in preparation by Mr. Magnus Spence. =The Marine Algæ of the Orkney Islands=, by G. W. Traill (Edinburgh, 1890), contains a list of the seaweeds of Orkney. The following are some general works on botany which may be of service to the beginner:—=Open-air Studies in Botany=, by R. L. Praeger (London, 1897), a study of wild flowers in their homes, with illustrations; =Flowering Plants, their Structure and Habitat=, by C. L. Laurie, illustrated (London, 1903); =Nature Studies=, by G. F. Scott-Elliot (London, 1903); =A Plant Book for Schools=, by O. V. Darbyshire, illustrated (London, 1908); =Flowers of the Field=, by C. A. Johns (London, 1894). =Common Objects of the Seashore=, by the Rev. J. G. Wood (London, 1866), contains good descriptions and illustrations of the seaweeds. For identification of plants perhaps the best books are the =British Flora=, by Bentham and Hooker (London, 1904), and =Illustrations to Bentham and Hooker’s British Flora=, by Fitch and Smith (London, 1905). For mosses, the best book is Dixon and Jameson’s =Student’s Handbook of British Mosses=. Zoology.