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POPULAR SCIENCE MONTHLY. 



value to the contents of this volume." 

 The few essays in Lange'a volume that 

 still remain untranslated are character- 

 ized as being mostly of an ephemeral 

 character. With the publication of the 

 present volume, of which, as of the Peda- 

 gogics, Miss Josephine Jarvis is the 

 translator, a complete list of the original 

 works of Froebel in English translations 

 has been provided in the International 

 Education Series of Messrs. D. Appleton 

 and Company. 



A useful manual for students in 

 chemistry is the Chemical Experiments 

 of Prof. John F. Woodhull and M. B. 

 Tan Arsdale (Henry Holt & Co., New 

 York). It embraces directions for mak- 

 ing seventy-five experiments with differ- 

 ent substances and chemical properties, 

 including oxygen and the air, hydrogen 

 and water, chlorine and the chlorine 

 family, acids, bases, salts, sulphur, nitro- 

 gen, carbon, carbon dioxide and the car- 

 bonates, fermentation, potash, and prob- 

 lems to illustrate the law of definite pro- 

 portions. A title is given to each experi- 

 ment, suggesting what is to be proved 

 by it; the details of the process are 

 given, and the pupil is left to do the rest, 

 entering his particular observations and 

 conclusions on the blank page opposite 

 the text. Questions are appended, of a 



nature further to develop the thinking 

 powers of the pupils, and tables or lists 

 are added of the elements concerned in 

 the experiments, weights and measures, 

 apparatus, and chemicals. 



The book Defective Eyesight: the 

 Principles of its Relief by Glasses, of 

 Dr. D. B. St. John Roosa, is the result 

 of an attempt to revise The Determi- 

 nation of the Necessity for Wearing 

 Glasses, published by the same author in 

 1888. It was found, on undertaking the 

 work of revision, that the advance in 

 our knowledge of the proper prescription 

 of glasses, especially in the matter of 

 simplicity in method, had been so great 

 as to require a complete rewriting. In 

 doing this the book has been very much 

 enlarged, and illustrations have been in- 

 troduced. The author hopes his manual 

 may prove a reliable guide to the stu- 

 dent and practitioner in ophthalmology, 

 and may also be of interest to persons 

 who wish to know the principles on 

 which the prescription of glasses is based. 

 The special subjects treated of are the 

 measurement of visual power, presby- 

 opia, myopia or short-sightedness, hyper- 

 metropia, corneal astigmatism, astheno- 

 pia, and the qualities of lenses. (Pub- 

 lished by the Macmillan Company. 

 Price, $1.) 



PUBLICATIONS RECEIVED. 



Agricultural Experiment Stations. Bul- 

 letins and Reports. North Carolina State 

 Agricultural Society: Second Annual Re- 

 port (1896) of the Experimental Farm at 

 Southern Pines. Pp. 90. Ohio: Press Bul- 

 letin No. 195. Stomach Worms in Sheep. 

 Pp. 2: No. 196. Comparison of Varieties 

 of Wheat. Pp. 2; No. 197. Successful 

 Treatment of Stomach Worms in Sheep. 

 Pp. 2; No. 198. Varieties of Wheat and 

 Home-mixed Fertilizers. Pp. 2. United 

 States Department of Agriculture: Month- 

 ly List of Publications (July, 1899). Pp. 

 4; Report on North American Fauna. No. 

 14. Natural History of the Tres Marias 

 Islands. Mexico. Pp.96; No. 15. Revision 

 of the Jumping Mice of the Genus Zaphuft. 

 By Edward A. Preble. Pp. 34, with one 

 plate; Report of the Puerto Rico Section 

 of the Weather and Crop Service of the 

 Weather Bureau, for May, 1899. Pp. 8. 



Baker, M. N. Potable Water and 

 Methods of Detecting Impurities. New 

 York: The Van Nostrand Company. (Van 

 Nostrand Science Series.) Pp. 97. 50 

 cents. 



Beman, W. W., and Smith, D. E. New 

 Plane and Solid Geometry. Boston: Ginn 

 & Co. Pp. 382. 



Bulletins. Proceedings, Reports, etc. 

 Boston Society of Natural History: Vol. 

 XXIX. No. 2. Variation and Sexual Se- 

 lection In Man. By E. T. Brewster. Pp. 



16; No. 3. Notes on the Reptiles and Am- 

 phibians of Intervale, New Hampshire. By 

 Glover M. Allen. Pp. 16; No. 4. Studies in 

 Dlptera Cyclorhapha. By G. & N. Hough. 

 Pp. 8: No. 5. Contributions from the 

 Gray Herbarium of Harvard University. 

 New Series: No. 17. By B. L. Robinson 

 and J. M. Greenman. Pp. 12. Dominion 

 of Canada: Parliamentary Standing Com- 

 mittee on Agriculture and Colonization. 

 Improvements in Crop Growing. By Prof. 

 James W. Robertson. Pp. 39. Interna- 

 tional Correspondence Schools, Scranton, 

 Pa.: General Circular. Pp. 32. Liberal 

 University, Silverton, Oregon: Announce- 

 ments. Pp. 18. Society of American Au- 

 thors: Bulletin for July, 1899. Pp. 22. 

 University of Michigan, Department of 

 Medicine and Surgery: Annual Announce- 

 ment for 1899-1900. Pp. 91. United States 

 Artillery Journal: Index to Vol. X, 1898. 

 Pp. 12. 



Carpenter, George H. Insects, their 

 Structure and Life. A Primer of Ento- 

 mology. New York: The Macrnlllan Com- 

 pany. Pp. 404. fl.75. 



Daniels, Winthrop Moore. The Elements 

 of Public Finance, including the Mone- 

 tary System of the United States. New 

 York: Henry Holt & Co. Pp. 383. $1.50. 



Grotius, Hugo, Proceedings at the Lay- 

 Ing of a Wreath on the Tomb of, July 4. 

 1899, by the Commission of the United 



