(1) Astronomy of To-Day A Popular Introduction in Non-Technical Language (2) Scientific Ideas of To-Day Popularly Explained

(1) Astronomy, a Handy Manual for Students and Others (2) Chats about Astronomy

(1) Athena: A Yearbook of the Learned World The English-speaking Races (2) The Yearbook of the Universities of the Empire, 1918 1920

(1) Biologia Marina Forme e Fenomeni della Vita nel Mare (2) Piscicoltura Pratica Legislazione sulla Pesca d'Acqua Dolce

(1) Botanisches Jahrbuch (2) Das Pflanzenreich (3) Recueil de l'Institut botanique

(1) Both Sides of Evolution: a Debate. (2) The Dogma of Evolution.

(1) British Museum (Natural History) British Antarctic (Terra Nova) Expedition, 1910 (2) Faune de France 16: Polychètes sédentaires; addenda aux errantes, Archiannélides, Myzostomaires

(1) Bücher der Naturwissenschaft (2) Aus Natur und Geisteswelt: Sammlung wissenschaftlich-gemeinverständlicher Darstellungen (3) Naturwissenschaftliche Bibliothek für Jugend und Volk (4) Series of Science Books for Austrian Secondary Schools

(1) Catalogue of the Books, Manuscripts, Maps, and Drawings in the British Museum (Natural History) (2) A Bibliography of the Tunicata, 1469-1910 (3) Catalogue of the Noctuidœ in the Collection of the British Museum (4) Catalogue of the Ungulate Mammals in

(1) Ceres. 1923.

(1) Ceres. Micrometric Observations: 9-inch Refractor.

(1) Charles Darwin: the Man and his Warfare (2) The Evolution of Charles Darwin (3) Darwinism and What it Implies

(1) Civilisation or Civilisations: an Essay in the Spenglerian Philosophy of History (2) Sunrise in the West: a Modern Interpretation of Past and Present

(1) Climate: a Treatise on the Principles of Weather and Climate (2) Die Klimate der Erde (3) Klimakunde von Südamerika

(1) Concerning Man's Origen being the Presidential Address given at the Meeting of the British Association held in leeds on Aug 31, 1927, and recent Essay on Darwinian Subjects (2) Religion without Revelation (3) The Church and Science: a Study of the Inte

(1) Cours de mécanique céleste (2) Cours d'astronomie Faculté des Sciences de Paris (3) Grundriss der theoretischen Astronomie und der Geschichte der Planetentheorien

(1) Das Prinzip der Erhaltung der Energie (2) Vererbung, Gedächtnis und Transzendentale Erinnerungen vom Standpunkte des Physikers (3) De la Méthode dans les Sciences (4) Materialistische Epoche und monistische Bewegung (5) Das Theorem des Pythagoras (6) E

(1) De Linné à Jussieu: Méthodes de la classification et idée de série en botanique et en zoologie (1740 1790) (2) Cuvier et Lamarck: Les classes zoologiques et l'idée de série animale (1790 1830)

(1) Deducing topology from the CMB; (2) The structure of closed hyperbolic 3-manifolds

(1) Der Bau des Weltalls (2) Die Planeten