SCIENC 



A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES. 



PUBLISHED BY N. D. C. HODGES, 874 BROADWAY, VF.W YOEK. 



Tenth Year. 

 Vol. XX. No. 493. 



JULY 8, 1892. 



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Single Copies, Ten Cents. 



"^10,, 



'o,j^ ^T.R Year, in Advance. 



"■sr 4-. 



Contents. 



Diamonds in Meteorites. Oliver Whipple 



Huntington 15 



The Number of Broods of the Imported 



Elm-Leaf Beetle. C. V. Riley. . 16 



The Reptilian Rattle. S. Garman. ... 16 



Opposition of Mars. Edgar L. Larkin. 17 



cross-fertillzina and hybridizing 18 



Notes and News 18 



On the Uncertainty of Conclusions. 



T. C. Mendenhall 20 



Remarks upon the Graphic System of 

 THE Ancient Mayas. Hilbome T. 

 Cresson S5 



Among the Publishers 27 



Entered at the Post-Offlce of New York, N.Y., as 

 Second-Class Mail Matter. 



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THE POPULAR SCIENCE MONTHLY. 



A culture that lacks science is a one-sided culture. 



The Popular Science Monthly is the one periodical that gives access to the scientific culture of the time, and it will in the future 

 represent scientific thought and achievement even more fully than it has in the past. The valuable series of illustrated articles on 



THE DEVELOPMlSNT OF AMERICAN INDUSTRIES SINCE COLUMBUS, 



now running in the Monthly, will be continued. There have already been published three articles on The Woolen Manufacture, by 

 S. N. D. North; four articles on The Making of Iron and two on The Making of Steel, by W. F. Dttrfee. The first of two articles on 

 American Pottery appears in the December number. All of these are profusely illustrated; and similar papers on The Cotton Manu- 

 facture, by Edward Atkinson and Gen. W. F. Draper; Piano-Making, by Daniel Spillane; Glass-Making, by Prof. C. Hanford 

 Henderson; and on The Leather, Silk, Paper, Agricultural Machinery, and Ship-building Industries will appear in coui'se. 



Hon. Carroll D. Wright will continue his incisive Lessons from the Census. Dr. Andrew D. White will contribute some con- 

 cluding papers on The Warfare of Science, and there will be occasional articles from Hon. David A. Wells and from David Stasb 

 Jordan, President of Stanford University. 



The other contents of the coming numbers can not be definitely announced at this time, but the character of the contributions may 

 be inferred from 



SOME OF THE ARTICLES OF THE PAST YEAR. 



The Colors of Letters, President David Starr Jordan. 



The Storage op Electricity (illustrated), Prof. Samuel Sheldon. 

 The Decline of Rural New England. Prof. A. N. Currier. 

 Cm-TITATION of Sisal in the Bahamas (illustrated), J. I. Northrop, Ph.D 

 Koch's Method of Treating Consumption, G. A. Heron, M.D. 

 . Street-Cleaning in Large Cities, Gen. Emmons Clark. 

 Professor Huxley on the War- Path, The Duke of Argyll. 

 Sketch of Daniel G. Beinton (with Portrait), C. C. Abbott. 

 Some Games op the Zutfi (illustrated), John G. Owens. 

 Our Agricultural Experiment Stations, Prof. C. L. Parsons. 



Dress and Adornment (illustrated). Prof. Frederick Starr. Four articles. 

 Professor Huxley and the Swine Miracle, W. E. GladstoTie. 

 Illustrations of Mr. Gladstone's Controversial Method, Prof. T. 1 



Huxley. 

 The Doctrine op Evolution, John Fiske. 

 Limits op State Duties, Herbert Spencer. 

 University Extension, Prof. C. Hanford Henderson. 

 Some op the Possibilities of Economic Botany, Prof. G. L. Goodale. 



Twenty years ago our first number was issued with the following statement: " The Popular Science Monthly has been started to 

 help on the work of sound public education, 'by supplying instructive articles on the leading subjects of scientific inquiry. It will contain 

 papers, original and selected, on a wide range of subjects, from the ablest scientific men of different countries, explaining their views to 

 non-scientific people." This task has grown larger and more important with the continual growth of science, and the scope and resources 

 of the Monthly have been correspondingly widened. No pains will be spared for its adequate performance in the future. 



EDITED BY WILLIAM JAY YOUMANS. 



D. APPLETON & CO., Publishers, 



$5.00 a year; 50 cents a number. 



1, 3, and 5 Bond Street, New York. 



