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THE POPULAR SCIENCE MONTHLY. 



In 1892 he publisl cd a work on the Future 

 of Silver, which, translated by Robert Stein 

 into English, is now printed and circulated 

 by the Finance Committee of the United 

 States Senate. In this essay the author 

 reaches the conclusion that, assuming that 

 the system of metallic coinage continues to 

 exist, silver will become the standard metal 

 of the earth, and that " the question is no 

 longer whether silver will again become a 

 full-value coinage metal over the whole 

 earth, but what are to be the trials through 

 which Europe is to reach that goal." 



Charles Denison's Climates of the United 

 States, in colors, already well known in its 

 form in charts, has been revised and con- 

 densed in dimensions, and is now published 

 in a convenient little volume by the W. T. 

 Keener Company, Chicago. It gives in 

 maps, with scales of colors graphically show- 

 ing the intensity of the phenomena in the 

 different regions, the average annual cloudi- 

 ness, rainfall, temperature, and winds, the 

 elevations of different regions, and the com- 

 bined atmospheric humidities and seasonal 

 isotherms and wind indications for each of 

 the seasons throughout the whole United 

 States, excepting Alaska. 



Dr. Adolf Brodbeck, of Zurich, believes 

 that in his little pamphlet, Die Zchn Gcbote 

 der Jesuiten (The Ten Commandments of the 

 Jesuits), the truth about the Jesuits and 

 their relation to Christendom is said for the 

 first time. The authorities on which he re- 

 lies are the classical writings of the order. 



George If. Boehmer prefaces an interest- 

 ing study of the Prehistoric Naval Architec- 

 ture of the North of Europe (United States 

 National Museum) with a brief notice of 

 Greek and Roman boats, the constructions 

 of the Germans, and such ancient boats as 

 have been found in England. By far the 

 largest part of the paper is devoted to Scan- 

 dinavian boats, of which a considerable 

 number have been found in the northern 

 countries. This gives opportunity to de- 

 scribe the situations and positions of these 

 boats, their surroundings, and the articles 

 which were found with or near them, so that 

 incidentally much information is conveyed 

 concerning Scandinavian archaeology in gen- 

 eral. 



Christ, the Patron of all Education, is the 

 title of a sermon preached by the Rev. 



Charles Frederick Hoffmann before St. 

 John's Guild of Hobart College, on the occa- 

 sion of the commencement of that institu- 

 tion in 1893. It is published, by request of 

 the guild and of members of the college 

 faculty, by E. and J. B. Young & Co., New 

 York. In company with it the same house 

 publishes, also by request, an address de- 

 livered by Dr. Hoffmann on the occasion of 

 the laying of the corner stone of St. Stephen's 

 College, Annandale-on-the-Hudson. The sub- 

 ject is The Library of a Divine Child. 



The composition of 7 he Study of the 

 Biology of Ferns by the Collodion Method 

 was begun by George F. Atkinson after he 

 had been successful in applying the method 

 in his classes to the preparation of the very 

 delicate tissues of ferns, and especially to 

 the infiltration of prothallia without shrink- 

 age. He started to prepare a simple labora- 

 tory guide, giving directions for preparing the 

 various tissues, with a few illustrations, made 

 chiefly from preparations put up by students 

 in their regular work, together with some de- 

 scriptive matter. Gradually other features 

 were added, and the book grew to its present 

 volume of 1 34 pages, constituting a fairly full 

 technical manual. The first part is descrip- 

 tive of the life cycle of ferns, their repro- 

 ductive organs, parts, growth, and functions. 

 The second part relates to methods of prep- 

 aration and examination. The study is pub- 

 lished by Macmillan & Co., New York, at the 

 price of $2. 



The Eighteenth Annual Report of the Sec- 

 retary of the Michigan State Board of Health 

 for 1889-'90, besides the regular matter of 

 official routine in the first part, contains in a 

 second part a number of papers, abstracts, 

 and reports, among which are one on the Prin- 

 cipal Meteorological Conditions in Michigan 

 in 1889; one on the Time of Greatest Prev- 

 alence of each Disease, being a study of the 

 causes of sickness in the State ; and one on 

 Dangerous Communicable Diseases in Michi- 

 gan in 1889, relating to diphtheria, smallpox, 

 measles, scarlet fever, typhoid fever, whoop- 

 ing-cough, pneumonia, dysentery, glandular 

 hydrophobia, and lump-jaw. Henry B. Baker, 

 Secretary, Lansing. 



The Rev. T, W. Webb's very useful and 

 convenient work on Celestial Objects for 

 Common. Telescopes a fitting companion for 

 Mr, Serviss's Astronomy with an Opera 



