The International Scientific Series.— (Continued.) 



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



Stallo. $1.75. 



39. THE BRAIN AND ITS FUNCTIONS. By J. Luys, Hospice Salpgtridre, 



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 Th. 



Ribot, author of " Heredity/ 1 $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. Jolt, Science Faculty of Tou- 



louse. With 148 Illustrations. $1.75. 



46. THE ORGANS OF SPEECH AND THEIR APPLICATION IN THE 



FORMATION OF ARTICULATE SOUNDS. By Professor G. H. von 

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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 Primi- 



tive Nervous Systems. By George J. Romanes, M. D., F. R. S. With 63 

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50. THE COMMON SENSE OF THE EXACT SCIENCES. By William King- 



don Clifford. With 100 Figures. $1.50. 



51. PHYSICAL EXPRESSION : Its Modes and Principles. By Francis War- 



ner, 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., Uni- 



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55. EARTHQUAKES AND OTHER EARTH MOVEMENTS. By Prof essor John 



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56. MICROBES, FERMENTS, AND MOULDS. By E. L. Trotjessart. With 



107 Illustrations. $1.50. 



57. THE GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION OF ANI- 



MALS. By Professor Angelo Heilprin, Academy of Natural Sciences, 

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58. WEATHER. A Popular Exposition of the Nature of Weather Changes from 



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