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POPULAR SCIENCE MONTHLY. 



tries of Pennsylvania; I, Clays of West- 

 ern Pennsylvania (in part). Pp. 183. 

 Howard, L. O. The Economic Status of 

 Insects as a Class. Pp. 33. Jackman, 

 Wilbur S. Constructive Work In the Com- 

 mon Schools. Pp. 18. 



Russell, Frank. Explorations in the 

 Far North. University of Iowa. Pp. 290. 



Schiavone, Mario. II Principio della 

 dirigibilita orizzontalie degli aerostate ed 

 Binaerostato (The Principle of the Hori- 

 zontal Dirigibility of Aerostats and the 

 Binaerostat. Potenza, Italy. Pp. 48. 



Schubert, Hermann. Mathematical 

 Essays and Recreations. Translated by 

 T. J. McCormack. Chicago: The Open 

 Court Publishing Company. Pp. 149. 75 

 cents. 



Scrutten, Percy E. Electricity in Town 

 and Country Houses. Second edition. 

 New York: The Macmillan Company. Pp. 

 148. $1. 



Sloyd Bulletin No. 2, March, 1899. 

 Boston: Sloyd Training School. Pp. 21. 



Smithsonian Institution publications: 

 Annual Report of the Board of Regents to 



July, 1896. Pp. 727; do. to July, 1897. Pp. 

 686. Bolton, H. C. A Select Bibliog- 

 raphy of Chemistry, 1492 to 1897. First 

 Supplement. Pp. 489. Cook, O. F. Af- 

 rican Diplopoda of the Genus Pachybolus. 

 Pp. 10, with plates. 



Society of American Authors. Month- 

 ly Bulletin. March, 1899. Pp. 16. 



United States Commissioner of Educa- 

 tion (W. T. Harris). Report for 1896-'97, 

 Vol. II. Pp. 1245. 



Veblen, Thorstein. The Theory of the 

 Leisure Class. New York: The Macmillan 

 Company. Pp. 400. $2. 



Waddell, John. The Arithmetic of 

 Chemistry. New York: The Macmillau 

 Company. Pp. 137. 90 cents. 



Wickersham, James. Major Powell's 

 Inquiry, " Whence came the American In- 

 dians? " An Answer. Tacoma, Washing- 

 ton: Allen and Lamborn Printing Com- 

 pany. Pp. 28. 



Writt, Henry. Some Observations on 

 the Fundamental Principles of Nature. 

 Chicago: P. O., Station N. Pp. 32. 25 

 cents. 



Death of Professor Marsh. 

 Othniel C. Marsh, professor of paleon- 

 tology in Yale University, and curator 

 of the geological collection of that in- 

 stitution, died of pneumonia at his 

 home in New Haven, Connecticut, March 

 18th. He had not been in good health 

 for several years, and succumbed to the 

 effects of a cold which he had caught 

 before wholly recovering from a pre- 

 vious cold. A sketch of his life up to 

 that time, embracing the most active 

 parts of his career as a geological ex- 

 plorer, in which he gained great renown, 

 was given, with a portrait, in the Pop- 

 ular Science Monthly for September, 

 1878. During the period that has in- 

 tervened he made studies of the re- 

 sults of his explorations and other geo- 

 logical work, and published papers of 

 very high scientific value. About a 

 year ago he transferred his extensive 

 and famous collections at the Peabody 

 Museum to the university. These col- 

 lections were among the finest of their 

 kind in the world, and were especially 

 remarkable for their fossils of immense 

 animals exhumed from the Western 

 plains. They were greatly admired by 

 Professor Gaudry, the eminent Erench 

 geologist, who spoke of them in terms 

 of high praise in the Revue des Deux 

 Mondes of October 15, 1898. It was 



through his efforts that the funds were 

 obtained from George Peabody, his 

 uncle, for the construction of the Pea- 

 body Museum, a part of which has been 

 built. His health having apparently 

 improved for a few months previous to 

 his death, he had been working with 

 renewed activity at the museum, and 

 had recently written articles on paleon- 

 tological subjects. Having consider- 

 able means of his own, he served the 

 university without salary, and carried 

 on his explorations mostly at his own 

 cost, paying large sums to assistants 

 and for other items in the work. He 

 left ten thousand dollars to the National 

 Academy of Sciences, of which he was 

 one of the founders and was for sev- 

 eral years president, and all of the rest 

 of his estate, estimated to be worth 

 nearly one hundred thousand dollars, 

 to Yale University. 



Popular Co-operation in Health 

 Work. In a review of A Quarter Cen- 

 tury of Public Health Work in Michi- 

 gan, Mr. Theodore R. MacClure, chief 

 clerk of the State Board of Health 

 office, says that experience in the State 

 has indicated that it is necessary to 

 have the co-operation of the people if 

 the dangerous communicable diseases 

 are to be restricted and prevented. In 



