For a scientific discussion of the phenomena of animal skill and intelligence we may perhaps best turn to Professor C. Lloyd Morgan, whose work is always both acute and cautious. In _Animal Life and Intelligence_ (1890) he has furnished an excellent introduction to the subject. In his _Introduction to Comparative Psychology_ (shortly to appear in the Contemporary Science Series) he discusses the fundamental problems of mental processes in animals, and the transition from animal intelligence to human intelligence. Romanes' _Mental Evolution in Animals_ (1883) and other works by this writer, dealing with the same subject, but proceeding on a different method, should also be studied; and his _Animal Intelligence_ (International Science Series) is an excellent critical summary of the facts. Buechner's _Aus dem Geistesleben der Thiere_ (Berlin, 1877) and Houzeau's _Facultes Mentales des Animaux_ (Brussels, 1877) may also be mentioned, and Espinas' _Societes Animales_ (1877), though dealing primarily with sociology, is an original and suggestive study of great value. As a general introduction, of a popular but not unscientific character, to all the various aspects of animal life, J. Arthur Thomson's little book, _The Study of Animal Life_ (University Extension Manuals, 1892), may be recommended. At the end of Mr. Thomson's volume will be found a useful classified list of the "Best Books" on animal life. GARDENING ANTS. The operations of various species of Gardening Ants have recently been very thoroughly investigated at Blumenau by Herr Alfred Moeller, nephew of Dr. Fritz Mueller ("Die Pilzgaerten einiger suedamerikanischer Ameisen." Heft 6 of Schimper's "Botanische Mittheilungen aus den Tropen." Jena: G. Fischer, 1893. Herr Moeller's work is clearly summarised by Mr. John C. Willis in "The Fungus Gardens of certain South American Ants," _Nature_, 24th August 1893).