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almost disabled him from intellectual work during a large part of his early manhood, and sometimes brought him to the verge of dispair. Nevertheless, it was while suffering from this great affliction that he succeeded with some help from his sister in preparing his text-book on chemistry, which at once made him known to the públic, and gave him the means of support. This treatise was, in Mr. Fiske's opinion, Youmans's germinal book, all his subsequent work being foreshadowed in it. Next came his career as a scientific lecturer, in which he was successful not only in a pecuniary way but also in increasing the popular interest in the physical sciences.

The rest of the book before us is devoted to those wider enterprises in which Youmans engaged, beginning with his first acquaintance with Herbert Spencer and his agency in securing the publication of Spencer's works in this country. This part of the book is enriched by a large amount of correspondence between the two men, which not only shows their business relations to each other and to their publishers, but reveals many interesting traits of character. There are also letters from Huxley, Tyndall and other scientists, besides many that passed between Youmans and the members of his family. A full account is also given of the establishment of the Popular Science Monthly, which, it seems, was successful from the start, and also of the International Scientific Series, which was not started without some difficulty, but which, as our readers well know, proved both scientifically and commercially successful in the end.

The book closes with a series of extracts from Youmans's writings, giving his views on education, on the relations between religion and science and on other subjects; so that readers have before them as full an

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account of the life and work of the popular scientist as they are likely to need, and one that is worthy of its subject and of its author.

Elements of Chemistry, Descriptive and Qualitative, Briefer Course. By JAMES H. SHEPARD. Boston, D. C. 'Heath and Co. 1863, 240 p.

THE success of Shepard's Inorganic Chemistry, as exemplified by its use in over three hundred and fifty colleges and schools, and by the high words of praise which have already been accorded it, is sufficient warrant of Professor Shepard's understanding of the needs of a school textbook in chemistry. The present volume is prepared as a briefer course and is intended to meet the needs of secondary school instruction, particularly where chemistry as a study has been forced into a limited period. In addition to the elements of inorganic chemistry, the author has added to the completeness of the work by a chapter on organic chemistry, treating successfully in an elementary manner this rather difficult department. The book is clear, concise, and well adapted for young pupils. It is interesting to note that Professor Shepard's Inorganic Chemistry has been recommended by the Committee of Secondary School Studies, appointed at the meeting of the National Educational Association.

NOTES AND NEWS.

A CROWDED meeting of the members of the Victoria Institute and their friends took place recently at London, England, in the Theatre of the Society of

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Arts, to hear Dr. Prestwich, F.R.S., read a paper Possible Cause for the Origin of the Tradition of the Flood," in which he "treated the subject from a purely scientific standpoint." The chair was taken by Sir George Stokes, Bart., F.R.S. On account of recent indisposition Dr. Prestwich was unable to travel up to London to be present, and had deputed Prof. Rupert Jones, F. R.S., to read the paper for him. The paper described at considerable length the various phenomena which came under the author's observation during long years of geological research throughout Europe and the coasts of the Mediterranean. He concluded by giving the reasons why he considered that these were "only explicable upon the hypothesis of a widespread and short submergence of continental dimensions, followed by early re-elevation, and this hypothesis satisfied all the important conditions of the problem." The age of man was held to be divided into Paleolithic and Neolithic, and he considered rightly So. He concluded by saying that thus there seemed cause for the origin of that widespread tradition of a flood. The paper was followed by reference to a communication from Sir W. Dawson, F. R.S., who welcomed the paper as confirming his conclusion, come to on geological and paleontological grounds, as to a physical break in the anthropic age. The evidence of this was afforded by the cave remains and from a vast quantity of other sources. The discussion which ensued was joined in by a considerable number, including Dr. Woodward, F.R.S., President of the Geological Society-who, in referring to Dr. Prestwich, regretted the forced absence of the Nestor of Geology, and expressed the hope that ere long he might be able to be present at another meeting of the Institute - Sir Henry Howorth, F. R.S., and Profs. T.

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-The latest volume, in Appleton's International Education Series is by Susan E. Blow, on Symbolic Education," being a commentary on Froebel's "Mother's Songs and Games." Miss Blow begins with an attack on Rousseau, which is in the main well deserved and effective; but we cannot agree with the opinion expressed at the end of the chapter that "between the views of Rousseau and those of Froebel there are in my judgment no affinities whatsoever." For the fundamental principle of Froebel's method of teaching is that the child's mind follows a natural course of development to which education, if it is to be successful, must conform; and this principle he obviously borrowed of Rousseau. Nor can we agree with Miss Blow's extreme views about the fondness of children for symbolism and the effectiveness of symbolic teaching in inculcating moral truth and forming virtuous habits. The old symbolic religions were certainly not very successful in improving morality, and we believe that such improvement in children can be much more effectively promoted by direct teaching and the influence of example than by any form of symbolism. In treating of Froebel's practical devices as employed in the kindergarten, Miss Blow has many things to say, some explanatory and some critical, which kindergarten teachers will find interesting and doubtless profitable; but we have no space to enlarge upon them here. We should add that this book contains

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Is

S it not true that, in a vague way, the usual conception of the cause of damage by lightning is that something (in past ages a "thunderbolt ") comes down from the thunder cloud to do the damage? Is it not true that since damage is done by lightning we should seek the mass of matter in which this energy must exist just before the flash? Is it not equally true that since Faraday's time we have known that this energy exists in the column of dielectric (mainly air) extending from the cloud to the carth? Do we not know since Lord Kelvin's experiments that this energy exists in the air on account of a state of electrical stress, which stress cannot exceed .0075 of a pound per square inch, and that consequently the amount of energy in each cubic foot of air cannot exceed about one foot-pound?

Knowing that the energy just before the flash exists in the column of air between the cloud and the earth, which column is indicated in the figure by the dotted lines, and that when the air "breaks down" and the flash comes this energy manifests itself mainly as heat along the central core of this column in what we call a flash of lightning, is it not evident that the energy must be transmitted in lines perpendicular to the lines of electrical stress, i.e., in the main horizontally, indicated in the figure by the arrows?

From all this, which is a part of our current knowledge, it appears that the problem of protection from lightning is a problem in the dissipation of energy; that the energy to be dissipated, while we know it to be considerable, as broken masonry testifies, is but a small part of the whole involved in a flash of lightning, by far the larger part being dissipated as heat above the roofs of our houses. If the conditions can be so arranged, by the use of considerable masses of metal suitably placed, that there shall be no state of stress below the roof of the house, then there will be no energy to be dissipated below that level, and all will go well. But it is surely time that the problem of protecting buildings from lightning should be looked upon as one in energetics and that it should be appreciated that the energy present cannot be hocus-pocussed out of the way but must be dissipated in some harmless manner.

The deflagration of a pound or two of thin copper ribbon dissipates a large amount of energy, how much we do not know, but experience shows it is so large that too little is left to do other damage when a house is struck by lightning. This lightning protector, manufactured under patents of N. D. C. Hodges, Editor of Science, is sent prepaid to any address on receipt of $5.00 per 100 feet. The amount ordered should be sufficent to run lines of the protector from the highest to the lowest points of the building, at intervals of about forty feet. Any carpenter can put it on.

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