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The International Scientific Series.-(Continued.)

3

38. THE CONCEPTS AND THEORIES OF MODERN PHYSICS. By J. B. STALLO. $1.75.

39. THE BRAIN AND ITS FUNCTIONS. By J. LUYS, Hospice Salpêtrière, Paris. With 6 Illustrations. $1.50.

40. MYTH AND SCIENCE. BY TITO VIGNOLI.

$1.50.

41. DISEASES OF MEMORY: An Essay in the Positive Psychology. By Tн. RIBOT, author of " Heredity." $1.50.

42. ANTS, BEES, AND WASPS. A Record of Observations of the Habits of the Social Hymenoptera. By Sir JOHN LUBBOCK, Bart., F. R. S., etc. $2.00. 43. THE SCIENCE OF POLITICS. By Professor SHELDON AMOS. $1.75. 44. ANIMAL INTELLIGENCE. BY GEORGE J. ROMANES, M. D., F. R. S. $1.75. 45. MAN BEFORE METALS. By Professor N. JOLY, Science Faculty of Toulouse. With 148 Illustrations. $1.75.

46. THE ORGANS OF SPEECH AND THEIR APPLICATION IN THE FORMATION OF ARTICULATE SOUNDS. By Professor G. H. VON

MEYER, University of Zürich. With 47 Illustrations. $1.75.

47. FALLACIES: A View of Logic from the Practical Side. By ALFRED SIDGWICK, B. A., Oxon. $1.75.

48. ORIGIN OF CULTIVATED PLANTS. By ALPHONSE DE CANDOLLE. $2.00. 49. JELLY-FISH, STAR-FISH, AND SEA-URCHINS. A Research on Primitive Nervous Systems. By GEORGE J. ROMANES, M. D., F. R. S. With 63 Illustrations. $1.75.

50. THE COMMON SENSE OF THE EXACT SCIENCES. By WILLIAM KINGDON CLIFFORD. With 100 Figures. $1.50.

51. PHYSICAL EXPRESSION: Its Modes and Principles. By FRANCIS WARNER, M. D., Assistant Physician, London Hospital. With 51 Illustrations. $1.75.

52. ANTHROPOID APES.

By Professor ROBERT HARTMANN, University of

Berlin. With 63 Illustrations. $1.75.

53. THE MAMMALIA IN THEIR RELATION TO PRIMEVAL TIMES. By Professor OSCAR SCHMIDT, University of Strasburg. With 51 Illustrations. $1.50.

54. COMPARATIVE LITERATURE. By Professor H. M. POSNETT, M. A., University College, Auckland. $1.75.

55. EARTHQUAKES AND OTHER EARTH MOVEMENTS. By Professor JOHN MILNE, Imperial College of Engineering, Tokio. With 38 Figures. $1.75. 56. MICROBES, FERMENTS, AND MOULDS. By E. L. TROUESSART. With 107 Illustrations. $1.50.

57. THE GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION OF ANIMALS. By Professor ANGELO HEILPRIN, Academy of Natural Sciences, Philadelphia. $2.00.

58. WEATHER. A Popular Exposition of the Nature of Weather Changes from Day to Day. With 96 Diagrams. By Hon. RALPH ABERCROMBY. $1.75.

The International Scientific Series.-(Continued.)

59. ANIMAL MAGNETISM. By ALFRED BINET and CHARLES FÉRÉ, Assistant Physician, Hospice Salpêtrière, Paris. With 15 Figures. $1.50.

60. INTERNATIONAL LAW, with Materials for a Code of International Law. By Professor LEONE LEVI, King's College, London. $1.50.

61. THE GEOLOGICAL HISTORY OF PLANTS. With 79 Illustrations. By Sir J. WILLIAM DAWSON, LL. D., F. R. S. $1.75.

62. ANTHROPOLOGY. An Introduction to the Study of Man and Civilization. By EDWARD B. TYLOR, D. C. L., F. R. S. With 78 Illustrations. $2.00. 63. THE ORIGIN OF FLORAL STRUCTURES, THROUGH INSECT AND OTHER AGENCIES. By the Rev. GEORGE HENSLOw, M. A., etc. With 88 Illustrations. $1.75.

64. THE SENSES, INSTINCTS, AND INTELLIGENCE OF ANIMALS, WITH SPECIAL REFERENCE TO INSECTS. By Sir JOHN LUBBOCK, Bart., F. R. S., etc. With 118 Illustrations. $1.75.

65. THE PRIMITIVE FAMILY IN ITS ORIGIN AND DEVELOPMENT. By Dr. C. N. STARCKE, University of Copenhagen. $1.75.

66. PHYSIOLOGY OF BODILY EXERCISE. By F. LAGRANGE, M. D. $1.75. 67. THE COLORS OF ANIMALS: Their Meaning and Use. By EDWARD BAGNALL POULTON, F. R. S. With 36 Illustrations and 1 Colored Plate. $1.75.

68. SOCIALISM: New and Old. By Professor WILLIAM GRAHAM, M. A., Queen's College, Belfast. $1.75.

69. MAN AND THE GLACIAL PERIOD. By Professor G. FREDERICK WRIGHT, D. D., Oberlin Theological Seminary. With 108 Illustrations and 3 Maps. $1.75.

70. HANDBOOK OF GREEK AND LATIN PALEOGRAPHY. By EDWARD MAUNDE THOMPSON, D. C. L., etc. $2.00.

71. A HISTORY OF CRUSTACEA. Recent Malacostraca. By the Rev. THOMAS R. R. STEBBING, M. A. With 51 Illustrations. $2.00.

72. RACE AND LANGUAGE. By Professor ANDRÉ LEFÈVRE, Anthropological School, Paris. $1.50.

73. MOVEMENT.

By E. J. MAREY. Translated by ERIC PRITCHARD, M. A.,

M. B., B. Ch. (Oxon.). With 200 Illustrations. $1.75.

74. ICE-WORK, PRESENT AND PAST. By T. G. BONNEY, LL. D., etc. With Maps and Illustrations. $1.50.

New York: D. APPLETON & CO., 72 Fifth Avenue.

[graphic]
[graphic]

FIG. A.-OSCILLATORY DISCHARGES. FIG. B.-NON-OSCILLATORY SPARKS

S, in a neighbouring conductor.

S', exciting oscillatory movements;
S", in a neighbouring conductor.

WHAT IS

ELECTRICITY?

BY

JOHN TROWBRIDGE, S. D.

RUMFORD PROFESSOR AND LECTURER ON THE APPLICATIONS OF SCIENCE
TO THE USEFUL ARTS, HARVARD UNIVERSITY, AND DIRECTOR
OF THE JEFFERSON PHYSICAL LABORATORY

ILLUSTRATED

NEW YORK

D. APPLETON AND COMPANY

1896

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