LONGMANS AND CO.'S STANDARD AND GENERAL WORKS. 29 



Popular Science (Natural History, etc.). 



Hartwig (Dr. George)— cow<i?iw«<i. 



DENIZENS OF THE DEEP. With 

 117 Illustrations. Crown 8vo, 2s. 6c?. 



VOLCANOES AND EARTHQUAKES. 

 With 30 Illustrations. Cr. 8vo, 2s. M. 



WILD AMIMALS OF THE TROPICS. 

 With 66 Illustrations. Cr. 8vo, 3s. M. 



Helmholtz.— POPULAR LECTURES 

 ON SCIENTIFIC SUBJECTS. By 

 Hermann von Helmholtz. With 68 

 Woodcuts. 2 vols. Cr. 8vo, 3s. 6<Z. each. 



Butler. — OUR HOUSEHOLD IN- 

 SECTS. An Account of the Insect- 

 Pests found in Dwelling-Houses. By 

 Edward A. Butler, B.A., B.Sc, 

 (Lond.). With 113 Illustrations. Cr. 

 8vo, 3s. U. 



Furneaux (W.). 



THE OUTDOOR WORLD; or, The 



Young Collector's Handbook. With 

 18 Plates (16 of which are coloured), 

 and 549 Illustrations in the Text. 

 Crown 8vo, 6s. net. 



BUTTERFLIES AND MOTHS 

 (British). With 12 coloured Plates 

 and 241 Illustrations in the Text. 

 Crown 8vo, 6s. net. 



LIFE IN PONDS AND STREAMS. 

 With 8 coloured Plates and 331 Illus- 

 trations in the Text. Cr. 8vo, ^s. net. 



Hartwig (Dr. George). 



THE SEA AND ITS LIVING WON- 

 DERS. With 12 Plates and 303 

 Woodcuts. 8vo, 7s. net. 



THE TROPICAL WORLD. With 8 

 Plates and 172 Woodcuts, 8vo, 7s. 

 net. 



THE POLAR WORLD. With 3 Maps. 

 8 Plates and 85 Woodcuts. 8vo, 7s. 

 net. 



THE SUBTERRANEAN WORLD. 

 With 3 Maps and 80 Woodcuts. 8vo, 

 • 7s. net. 



HEROES OF THE POLAR WORLD. 

 With 19 Illustrations. Crown 8vo, 2s. 



WONDERS OF THE TROPICAL 

 FORESTS. With 40 Illustrations. 

 Crown 8vo, 2s. 



WORKERS UNDER THE GROUND. 

 With 29 Illustrations, Crown 8vo, 2s. 



MARVELS OVER OUR HEADS. 



With 29 Illustrations. Crown 8vo, 2s. 



SEA MONSTERS AND SEA BIRDS. 

 With 75 Illustrations. Cr. 8vo, 2s. ^d. 



Hudson (W. H.). 



NATURE IN DOWNLAND. 12 Plates 

 and 14 Illustrations in the Text, by 

 A. D, McCoRMiCK. 8vo, 10s. M. net. 



BRITISH BIRDS, With a Chapter on 

 Structure and Classification by Frank 

 E, Beddard, F.R.S. With 16 Plates 

 (8 of which are Coloured), and over 

 100 Illustrations in the Text, Crown 

 8vo, %s. net. 



BIRDS IN LONDON. With 17 Plates 

 and 15 Illustrations in the Text, by 

 Bryan Hook, A, D. McCormick, 

 and from Photographs from Nature, 

 by R, B. Lodge. 8vo, 12s, 



Proctor (Richard A.). 



LIGHT SCIENCE FOR LEISURE 

 HOURS. Familiar Essays on Scien- 

 tific Subjects. First Series. Crown 

 8vo, 35. ^d, 



ROUGH WAYS MADE SMOOTH. 



Familiar Essays on Scientific Subjects, 

 Crown 8vo, 3s. 60?. 



PLEASANT WAYS IN SCIENCE. 

 Crown 8vo, 3s, 6c?. 



NATURE STUDIES. By R, A, Proc- 

 tor, Grant Allen, A, Wilson, T. 

 Foster and E, Clodd. Cr. 8vo, 3s, ^d. 



LEISURE READINGS. By R. A. 

 Proctor, E, Clodd, A. Wilson, T, 

 Foster and A. C, Ranyard, Crown 

 8vo, 3s. 6c/, 



