Sixf'H Year. 

 Vol. XII. No. 2go. 



NEW YORK, August 24, li 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance. 



fintnred nt New York Poat-Offloe as Seoond-Olags Mail-Matter. 



Editorial 85 



Major Powell on the Cutting Power of Rivers. — The Study of 

 .statistics in America. 



Prevention of Floods in the Lower Missis- 

 sippi 85 



The Thirty Seventh Meeting of the Ameri- 

 can Association . 87 



Scientific Newrs in Washington. 



School Attendance in the United States . . .87 



The Plastering of Wine . . . . .89 



Motions of the Solar System . Onnond Stone 89 

 Some Phases in the Progress of Chemistry 



C. E. Munroe 90 



On the International Geological Congress, 

 and Our Part in it as American Geolo- 

 gists . . George JI. Cook 



Altruism considered Economically 



Charles W. Smiley 



Book-Reviews. 



Three Crui.ses of the "Blake" .... 

 Entomology for Beginners .... 



An Elementary Course in Descriptive Geometry 



Notes and News ..... 

 Letters to the Editor. 



Our Native Birds Wm. T. Davis; Ji. B. Fulton; L. N.Johnson 

 Queries ....... 



92 



93 



95 

 95 

 95 



95 



96 

 96 



The Scieizce Company, Ptiblishers, ^/ Lafayette Place, New York. 



London ap-ent : G. E. Stechert, 26 Kincr William St., Strand. 



MACMILLAN & CO.'S 



TEXT BOOKS IN SCIENCE. 



ASTRONOMY. Elementary Lessons in Astronomy. By J, 

 Norman Lockyer, F. R.S. New edition revised throughout. VVi' 

 colored diagram and plates. t6mo. $1.25. 

 The most f.-iscinating of elemenl.iry books in the ^c^anzc^.—Noncon/orntiri. 



A Handbook of Descriptive Astronomy. By George F. 



Chambers,F.R.A.S. Third edition. 8vo. Oxford Clarendon Press, S7. 

 BIOLOGY. A Course of Elementary Instruction on Prac- 

 tical Biology. By T. H. Huxlev, LL.D., F.R.S., assisted by H. 

 N. Martin, M.A., M.D., D.Sc, F.R.S. Revised edition, extended 

 and edited by B. G. Howes and D. H. Scott, M.A. With a preface 

 by Professer Huxley, F.R.S. l2mo. $2.50. 

 CHEMISTRY. Lessons in Elementary Chemistry, Inorganic 

 AND Organic. By Sir Henry E. Roscoe, LL.D., F.R.S. Professor 

 of Chemistry in the Victoria University. New edition. l6mo. $1.10. 

 We unhesitatingly pronounce it the best of all our elementary treatises on chem- 

 istry. — Mediial Tunes. 



The Stevens College Junior Course of Pr.actical Chemistry. 



By Francis Jones.F.R.S.E., F.C.S. With a preface by SirH.E. Roscoe. 



i6mo. 70c. 

 A Treatise on the Principles of Chemistry. By M. M. 



Paltison Muir, M.A., F.R.S E. 8vo. Cambridge Univ. Press. $4 50. 

 ELECTRICITY AND MAGNETISM. Elementary Lessons 



IN Elkctkicity and Magnetism. Bv Sylvanus P. Thompson, 



D.Sc. B.A., F.R..A S. Illustrated. i6mo. $1.25. 

 A model of what an elementary book should hz.—Saturdny Review. 



Lessons for Elementary Physics. By Balfour Stewart, M.A., 



LL.D., F.R.S., and W. W. Haldane Gee, B.Sc. Vol. 2. Elec- 

 tricity AND Magnetism. i2mo. $2.25. 



Practical Physics for Schools and the Junior Students of 



Colleges. By Balfour Stewart, M.A., LL.D., F.R.S. and W W. 

 Haldane Gee.B.Sc. Vol. i. Electricity AND Magnetism. i6mo. 6oc. 



GEOLOGY. Text-Book of Geology. By Archibald Geikie, 

 LL.D., F.R.S. Illustrated. Second edition. 8vo. $7-50. 

 A noble and masterly work. — Christian .Advocate. 



Class- Book of Geology. By the same author. Profusely illus- 

 trated with woodcuis. I2mo. f2.6o. 

 MORAL PHILOSOPHY, &c. Handbook of Moral Philoso- 

 OPHY. By the Rev. Heniy Calderwood, LL.D., Professor of Moral 

 Philosophy in the University of Edinburgh. I2mo. $1 50. 

 It is we feel convinced the best handbook on the subject, intellectually and mor- 

 ally, and does infinite credit to its author.— Standard. 



I Elementary Lessons on Logic, Deductive and Reductive, 



**V with Copious Questions and Examples and a Vocabulary of 



^^OGiCAL Terms. By the late W. Stanley Jevons, LL.D. i6mo. 40c. 



-/' ' j?j, -anual alike simple, interesting, and scientific. — AtheniEum. 



- ''''ff'^ ^ Elements of Deductive Logic. Designed mainly for 



'i.'?"^*lV^->F junior students in the Universities. By Thomas 



Fo\» '''tj5,°W.-) Professor of Logic in the University ot Oxford. l6mo. 



Oxforu 'ift.-'fe.'on Press. 90 cents. 

 The ' ^n^l rs of Inductive Logic. By the same author. 



l6mo. Oxi '^■' Clarendnn Press. $1.50. 

 The Methods of Ethics. By Professor Henry Sedgwick, M.A., 



Professor of Moral Philosophy in the University of Cambridge. 



Third edition. Svo. .?4- 

 Outlines of the History of Ethics for English Readers. 



By the same author. i2mo. $1.25. 

 Prolego.mena to Ethics. By the late Thomas Hill Gnen, M.A., 



LL D. Edited by A. C. I'.radley, M.A. Second Edition. Svo. 



Oxford Clarend.m Press. $2 75. 

 PHYSICS. Lessons in Elementary Phy.sics. By Balfour Stewart, 



M A., LL.D., F.R.S. New and enlarged edition, Tllus. i6mo. $1.10. 

 The beau-Ideal of a scientific Ic.xt-book, clear, accurate, and thorough.— Educa- 

 tianal Times. 



Lessons in Ele.mfntary Practical Physics. Bv Balfour Stew- 

 art. M.A., LL.D., F.R S., and W. W. Halden Gee, Vol. I. General 

 Physical Processes. i2mo. $1.50. 



A Text-Book of the Principles of Physics. By Alfred Dan- 



iell, M.A., LL D. 2d editiim, revised and enlarged. Svo. $350. 

 Unquestionably the best elemcntarv text-book for advanced students that has 



yet appeared in the English language. — Ch'eato Triiune. 



PHYSIOLOGY. LissoNS in Elementary Phystologv. Uy 

 Thomas H. Huxley. I. L D., F.R.S. Revised edition. i6nio. $1.10. 

 The present edition has been more extensively revised than any of its 

 predecessors. 

 Unquestionably the clearest and most complete elementary treatise on this sub- 

 ject that we possess in any language. — tt'esl minster Ker'irTt'. 



.\ Course of Elementary Natural Physkilogy. By M. Fos- 

 ter, M.D. F.R.S., and J. N, Langley, M..A.., F.R.S. 5lh edition. 

 121110. $2. 



A Text-Book of Physiology. By Mich.iel Foster, M.D., F.R.S. 



4ih edition. Svo. $S.50. 

 One of the best text-books on physiology extant. — Lancet. 



Macmillan it Co.''s yew General Cataloijue sent free 



api)!icalwn. 



MACMILLAN & CO., 112 FOURTH AVENUE, NEW YORK. 



