THE CONSTITUTION OF MATTER AND THE EVOLUTION OF THE ELEMENTS1
UNIT OF ELECTRICITY
OBJECTIONS TO THE ATOMIC THEORY
COUNTING ATOMS AND ELECTRONS
TRACKS OF SWIFT ATOMS AND ELECTRONS
TRANSFORMATION OF MATTER
STRUCTURE OF THE ATOM
CHARGE CARRIED BY THE NUCLEUS
NUCLEUS CHARGE AND CHEMICAL PROPERTIES
RADIOACTIVE ELEMENTS AND THE PERIODIC SERIES
DISTRIBUTION OF ELECTRONS IN THE ATOM
EVOLUTION OF THE ELEMENTS
PROFESSOR SIR ERNEST RUTHERFORD
SPECULATIONS as to the constitution of matter have occupied an important place in the development of scientific knowledge. The idea that all matter was composed of minute particles called atoms was put forward long ago by the Greek philosophers, and was advanced again with varying degrees of confidence by philosophic men at the dawn of the scientific age.
EUROPE had no finer human stock than that of France, and no modern people has suffered more from the ravages of war and glory. The Gauls, as they appear in early history, were a Celtic race. Conquest made them Gallo-Roman. Later, especially in the north and east, their blood was strengthened by Teutonic strains—the Normans from Scandinavia and the Franks from Central Germany.
FROM the flood of writings called out by the war in Europe, a few things have become fairly clear. For instance, it is evident that this is the most costly and the most tragic of all the wars of history, that it has proceeded from the least apparent causes, and that it has come in the face of new and powerful forces making for peace.
SOME PIONEERS IN MOSQUITO SANITATION AND OTHER MOSQUITO WORK. II.
DR. L. O. HOWARD
Dr. Oswaldo Conçalves Cruz, director of the Instituto Oswaldo Cruz, Rio Janeiro, Brazil. The work of the Oswaldo Cruz Institute in regard to the carriage of disease by insects has been of the highest type. The men are trained in all bacteriological and morphological methods, and their work has placed the institute among the first in the world.
SOME ECONOMIC FACTORS INFLUENCING THE FORESTRY SITUATION
A. F. HAWES
IN the movement for the conservation of our natural resources, which is now rapidly gaining strength in our eastern states, as well as in the national government, the influence of many factors must he taken into consideration, and the question may very well arise as to whether our representative form of government, as exemplified in our national congress, our state legislatures, and city councils, is sufficiently far sighted to cope with them.
THE conservation of human life stands next to the giving of life and inseparably one with it as the supreme task of woman. The birth rate is affected by so many different factors that conclusions must not be hastily drawn from any given set of figures.
WE in America are so accustomed to the idea of social progress, and so familiar with certain actual or so-called progressive ideals, progressive factors and progressive movements, not to speak of progressive parties, that we are likely to assume that progress is general and in the nature of things.
IF we take a naïve attitude toward primitive ritualism, we must wonder how it ever came about that people believe the proper method for attaining any desired end to be the use of a formula. Thus, we may note a Dakota Indian tossing a handful of dust into the air when going into battle to ensure victory, and wonder how a people, who otherwise impress one as intelligent, could possibly entertain so absurd a belief.
THE PACIFIC COAST MEETING OF THE AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE
NATIONAL CONTRIBUTIONS TO SCIENCE
THE NEW SCIENCE MUSEUM IN LONDON
THE first meeting of the American Association for the Advancement of Science west of the Rocky Mountains is an event of more than usual importance for science in America. It signifies both the development of a great scientific center on the Pacific Coast and the unity of the scientific interests of the country.